diff --git a/doc/generated/shaders.cpp b/doc/generated/shaders.cpp
index 743a2a809..8e6aaf4ca 100644
--- a/doc/generated/shaders.cpp
+++ b/doc/generated/shaders.cpp
@@ -33,7 +33,7 @@
 #elif defined(CORRADE_TARGET_WINDOWS)
 #include <Magnum/Platform/WindowlessWglApplication.h>
 #else
-#error No windowless application available on this platform
+#error no windowless application available on this platform
 #endif
 
 #include <Magnum/Buffer.h>
diff --git a/src/Magnum/BufferImage.h b/src/Magnum/BufferImage.h
index 400b2eda5..9a70c74a3 100644
--- a/src/Magnum/BufferImage.h
+++ b/src/Magnum/BufferImage.h
@@ -141,7 +141,7 @@ template<UnsignedInt dimensions> inline BufferImage<dimensions>& BufferImage<dim
     return *this;
 }
 #else
-#error this header is available only on desktop OpenGL and OpenGL ES 3.0 build
+#error this header is not available in OpenGL ES 2.0 build
 #endif
 
 }
diff --git a/src/Magnum/BufferTexture.h b/src/Magnum/BufferTexture.h
index 22bd854bc..4ba1d6827 100644
--- a/src/Magnum/BufferTexture.h
+++ b/src/Magnum/BufferTexture.h
@@ -299,7 +299,7 @@ class MAGNUM_EXPORT BufferTexture: public AbstractTexture {
 
 }
 #else
-#error this header is available only on desktop OpenGL build
+#error this header is not available in OpenGL ES build
 #endif
 
 #endif
diff --git a/src/Magnum/CubeMapTextureArray.h b/src/Magnum/CubeMapTextureArray.h
index 8b6d361f5..57955eb0d 100644
--- a/src/Magnum/CubeMapTextureArray.h
+++ b/src/Magnum/CubeMapTextureArray.h
@@ -503,7 +503,7 @@ class MAGNUM_EXPORT CubeMapTextureArray: public AbstractTexture {
 
 }
 #else
-#error this header is available only on desktop OpenGL build
+#error this header is not available in OpenGL ES build
 #endif
 
 #endif
diff --git a/src/Magnum/Implementation/TransformFeedbackState.h b/src/Magnum/Implementation/TransformFeedbackState.h
index 9f406775c..ebfb431c6 100644
--- a/src/Magnum/Implementation/TransformFeedbackState.h
+++ b/src/Magnum/Implementation/TransformFeedbackState.h
@@ -28,7 +28,7 @@
 #include "Magnum/Context.h"
 
 #ifdef MAGNUM_TARGET_GLES2
-#error This header is not available in OpenGL ES 2.0 build.
+#error this header is not available in OpenGL ES 2.0 build
 #endif
 
 namespace Magnum { namespace Implementation {
diff --git a/src/Magnum/MultisampleTexture.h b/src/Magnum/MultisampleTexture.h
index 810f69eaf..cc07b68c9 100644
--- a/src/Magnum/MultisampleTexture.h
+++ b/src/Magnum/MultisampleTexture.h
@@ -226,7 +226,7 @@ typedef MultisampleTexture<3> MultisampleTexture2DArray;
 
 }
 #else
-#error this header is available only on desktop OpenGL build
+#error this header is not available in OpenGL ES 2.0 build
 #endif
 
 #endif
diff --git a/src/Magnum/Platform/AndroidApplication.h b/src/Magnum/Platform/AndroidApplication.h
index aa96ca5b6..00b869e47 100644
--- a/src/Magnum/Platform/AndroidApplication.h
+++ b/src/Magnum/Platform/AndroidApplication.h
@@ -38,7 +38,7 @@
 #include "Magnum/Platform/Platform.h"
 
 #ifndef CORRADE_TARGET_ANDROID
-#error This file is available only on Android
+#error this file is available only on Android build
 #endif
 
 /* Undef Xlib nonsense which might get pulled in by EGL */
diff --git a/src/Magnum/Platform/Implementation/EglContextHandler.cpp b/src/Magnum/Platform/Implementation/EglContextHandler.cpp
index 8b3442cca..42d7d6997 100644
--- a/src/Magnum/Platform/Implementation/EglContextHandler.cpp
+++ b/src/Magnum/Platform/Implementation/EglContextHandler.cpp
@@ -73,7 +73,7 @@ VisualId EglContextHandler::getVisualId(EGLNativeDisplayType nativeDisplay) {
         #elif defined(MAGNUM_TARGET_GLES2)
         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
         #else
-        #error Unsupported OpenGL edition
+        #error unsupported OpenGL edition
         #endif
         EGL_NONE
     };
@@ -137,7 +137,7 @@ void EglContextHandler::createContext(const AbstractXApplication::Configuration&
         #elif defined(MAGNUM_TARGET_GLES2)
         attributes[1] = 2;
         #else
-        #error Unsupported OpenGL ES version
+        #error unsupported OpenGL ES version
         #endif
     }
     #endif
diff --git a/src/Magnum/Platform/Implementation/GlxContextHandler.cpp b/src/Magnum/Platform/Implementation/GlxContextHandler.cpp
index 4ba23bfc7..6a2265610 100644
--- a/src/Magnum/Platform/Implementation/GlxContextHandler.cpp
+++ b/src/Magnum/Platform/Implementation/GlxContextHandler.cpp
@@ -114,7 +114,7 @@ void GlxContextHandler::createContext(const AbstractXApplication::Configuration&
         #elif defined(MAGNUM_TARGET_GLES2)
         attributes[1] = 2;
         #else
-        #error Unsupported OpenGL ES version
+        #error unsupported OpenGL ES version
         #endif
         attributes[2] = GLX_CONTEXT_MINOR_VERSION_ARB;
         attributes[3] = 0;
diff --git a/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.cpp b/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.cpp
index 7a58a698d..4a4a7cd54 100644
--- a/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.cpp
+++ b/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.cpp
@@ -48,7 +48,7 @@
 
 /* Otherwise unsupported */
 #else
-#error Unsupported platform
+#error unsupported platform
 #endif
 
 namespace Magnum { namespace Platform { namespace Implementation {
@@ -108,7 +108,7 @@ auto OpenGLFunctionLoader::load(const char* const name) -> FunctionPointer {
 
 /* Otherwise unsupported */
 #else
-#error Unsupported platform
+#error unsupported platform
 #endif
 
 }}}
diff --git a/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.h b/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.h
index f88605ed1..2d89eb37d 100644
--- a/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.h
+++ b/src/Magnum/Platform/Implementation/OpenGLFunctionLoader.h
@@ -64,7 +64,7 @@ class OpenGLFunctionLoader {
 
         /* Otherwise unsupported */
         #else
-        #error Unsupported platform
+        #error unsupported platform
         #endif
 };
 
diff --git a/src/Magnum/Platform/NaClApplication.h b/src/Magnum/Platform/NaClApplication.h
index 8c874081a..600de68a5 100644
--- a/src/Magnum/Platform/NaClApplication.h
+++ b/src/Magnum/Platform/NaClApplication.h
@@ -53,7 +53,7 @@ namespace pp {
 }
 
 #ifndef CORRADE_TARGET_NACL
-#error This header is available only on Google Chrome Native Client
+#error this header is available only on Google Chrome Native Client build
 #endif
 
 namespace Magnum { namespace Platform {
diff --git a/src/Magnum/Platform/Sdl2Application.cpp b/src/Magnum/Platform/Sdl2Application.cpp
index 30d0bb8b1..1ee227793 100644
--- a/src/Magnum/Platform/Sdl2Application.cpp
+++ b/src/Magnum/Platform/Sdl2Application.cpp
@@ -148,7 +148,7 @@ bool Sdl2Application::tryCreateContext(const Configuration& configuration) {
         #elif defined(MAGNUM_TARGET_GLES2)
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
         #else
-        #error Unsupported OpenGL ES version
+        #error unsupported OpenGL ES version
         #endif
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
         SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
diff --git a/src/Magnum/Platform/WindowlessGlxApplication.cpp b/src/Magnum/Platform/WindowlessGlxApplication.cpp
index bd5827113..372be34b7 100644
--- a/src/Magnum/Platform/WindowlessGlxApplication.cpp
+++ b/src/Magnum/Platform/WindowlessGlxApplication.cpp
@@ -79,7 +79,7 @@ bool WindowlessGlxApplication::tryCreateContext(const Configuration&) {
         #elif defined(MAGNUM_TARGET_GLES2)
         GLX_CONTEXT_MAJOR_VERSION_ARB, 2,
         #else
-        #error Unsupported OpenGL ES version
+        #error unsupported OpenGL ES version
         #endif
         GLX_CONTEXT_MINOR_VERSION_ARB, 0,
         GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_ES2_PROFILE_BIT_EXT,
diff --git a/src/Magnum/Platform/magnum-info.cpp b/src/Magnum/Platform/magnum-info.cpp
index 120b129dc..2feb77656 100644
--- a/src/Magnum/Platform/magnum-info.cpp
+++ b/src/Magnum/Platform/magnum-info.cpp
@@ -65,7 +65,7 @@
 #elif defined(CORRADE_TARGET_WINDOWS)
 #include "Magnum/Platform/WindowlessWglApplication.h"
 #else
-#error No windowless application available on this platform
+#error no windowless application available on this platform
 #endif
 
 namespace Magnum {
@@ -170,7 +170,7 @@ MagnumInfo::MagnumInfo(const Arguments& arguments): Platform::WindowlessApplicat
     #elif defined(CORRADE_TARGET_WINDOWS)
     Debug() << "Used application: Platform::WindowlessWglApplication";
     #else
-    #error No windowless application available on this platform
+    #error no windowless application available on this platform
     #endif
     Debug() << "Compilation flags:";
     #ifdef CORRADE_GCC47_COMPATIBILITY
diff --git a/src/Magnum/PrimitiveQuery.h b/src/Magnum/PrimitiveQuery.h
index 034d02926..8fe684458 100644
--- a/src/Magnum/PrimitiveQuery.h
+++ b/src/Magnum/PrimitiveQuery.h
@@ -128,6 +128,8 @@ class PrimitiveQuery: public AbstractQuery {
 };
 
 }
+#else
+#error this header is not available in OpenGL ES 2.0 build
 #endif
 
 #endif
diff --git a/src/Magnum/RectangleTexture.h b/src/Magnum/RectangleTexture.h
index 6c37fa975..d33e3086f 100644
--- a/src/Magnum/RectangleTexture.h
+++ b/src/Magnum/RectangleTexture.h
@@ -414,7 +414,7 @@ class MAGNUM_EXPORT RectangleTexture: public AbstractTexture {
 
 }
 #else
-#error this header is available only on desktop OpenGL build
+#error this header is not available in OpenGL ES build
 #endif
 
 #endif
diff --git a/src/Magnum/Test/AbstractOpenGLTester.h b/src/Magnum/Test/AbstractOpenGLTester.h
index 8f7b585b7..1f663b9ed 100644
--- a/src/Magnum/Test/AbstractOpenGLTester.h
+++ b/src/Magnum/Test/AbstractOpenGLTester.h
@@ -35,7 +35,7 @@
 #if !defined(MAGNUM_TARGET_GLES) || defined(MAGNUM_TARGET_DESKTOP_GLES)
 #include "Magnum/Platform/WindowlessGlxApplication.h"
 #else
-#error Cannot run OpenGL tests on this platform
+#error cannot run OpenGL tests on this platform
 #endif
 
 namespace Magnum { namespace Test {
diff --git a/src/Magnum/Text/fontconverter.cpp b/src/Magnum/Text/fontconverter.cpp
index 586f3b6c5..2efbc7d63 100644
--- a/src/Magnum/Text/fontconverter.cpp
+++ b/src/Magnum/Text/fontconverter.cpp
@@ -39,7 +39,7 @@
 #elif defined(CORRADE_TARGET_WINDOWS)
 #include "Magnum/Platform/WindowlessWglApplication.h"
 #else
-#error No windowless application available on this platform
+#error no windowless application available on this platform
 #endif
 
 #include "fontconverterConfigure.h"
diff --git a/src/Magnum/TextureArray.h b/src/Magnum/TextureArray.h
index d50a344ac..fe021b652 100644
--- a/src/Magnum/TextureArray.h
+++ b/src/Magnum/TextureArray.h
@@ -562,7 +562,7 @@ typedef TextureArray<2> Texture2DArray;
 
 }
 #else
-#error this header is not available on OpenGL ES 2.0 build
+#error this header is not available in OpenGL ES 2.0 build
 #endif
 
 #endif
diff --git a/src/Magnum/TextureTools/distancefieldconverter.cpp b/src/Magnum/TextureTools/distancefieldconverter.cpp
index 3c2ed6971..9ad8533fd 100644
--- a/src/Magnum/TextureTools/distancefieldconverter.cpp
+++ b/src/Magnum/TextureTools/distancefieldconverter.cpp
@@ -45,7 +45,7 @@
 #elif defined(CORRADE_TARGET_WINDOWS)
 #include "Magnum/Platform/WindowlessWglApplication.h"
 #else
-#error No windowless application available on this platform
+#error no windowless application available on this platform
 #endif
 
 #include "distancefieldconverterConfigure.h"
diff --git a/src/Magnum/TransformFeedback.h b/src/Magnum/TransformFeedback.h
index 6e4c02ac7..61fd852e7 100644
--- a/src/Magnum/TransformFeedback.h
+++ b/src/Magnum/TransformFeedback.h
@@ -383,7 +383,7 @@ inline TransformFeedback& TransformFeedback::operator=(TransformFeedback&& other
 
 }
 #else
-#error This header is not available in OpenGL ES 2.0 build.
+#error this header is not available in OpenGL ES 2.0 build
 #endif
 
 #endif