diff --git a/src/AbstractImage.cpp b/src/AbstractImage.cpp
index d593752a7..4442dad7b 100644
--- a/src/AbstractImage.cpp
+++ b/src/AbstractImage.cpp
@@ -133,7 +133,6 @@ std::size_t AbstractImage::pixelSize(ColorFormat format, ColorType type) {
     }
 
     CORRADE_ASSERT_UNREACHABLE();
-    return 0;
 }
 
 }
diff --git a/src/AbstractShaderProgram.cpp b/src/AbstractShaderProgram.cpp
index a290dd070..c75ad6386 100644
--- a/src/AbstractShaderProgram.cpp
+++ b/src/AbstractShaderProgram.cpp
@@ -762,7 +762,6 @@ std::size_t FloatAttribute::size(GLint components, DataType dataType) {
     }
 
     CORRADE_ASSERT_UNREACHABLE();
-    return 0;
 }
 
 #ifndef MAGNUM_TARGET_GLES2
@@ -780,7 +779,6 @@ std::size_t IntAttribute::size(GLint components, DataType dataType) {
     }
 
     CORRADE_ASSERT_UNREACHABLE();
-    return 0;
 }
 #endif
 
@@ -792,7 +790,6 @@ std::size_t DoubleAttribute::size(GLint components, DataType dataType) {
     }
 
     CORRADE_ASSERT_UNREACHABLE();
-    return 0;
 }
 #endif
 
@@ -827,7 +824,6 @@ std::size_t Attribute<Math::Vector<4, Float>>::size(GLint components, DataType d
     }
 
     CORRADE_ASSERT_UNREACHABLE();
-    return 0;
 }
 
 Debug operator<<(Debug debug, SizedAttribute<1, 1>::Components value) {