diff --git a/src/MagnumExternal/OpenGL/GL/flextGL.h b/src/MagnumExternal/OpenGL/GL/flextGL.h
index 941e89324..927f8322c 100644
--- a/src/MagnumExternal/OpenGL/GL/flextGL.h
+++ b/src/MagnumExternal/OpenGL/GL/flextGL.h
@@ -13,7 +13,7 @@
 #error Attempt to include auto-generated header after including glext.h
 #endif
 #if defined(__gltypes_h_)
-#error Attempt to include auto-generated header after gltypes.h
+#error Attempt to include auto-generated header after including gltypes.h
 #endif
 #if defined(__gl_ATI_h_)
 #error Attempt to include auto-generated header after including glATI.h
diff --git a/src/MagnumExternal/OpenGL/GL/flextGL.h.template b/src/MagnumExternal/OpenGL/GL/flextGL.h.template
index d7d546f08..0876bca4e 100644
--- a/src/MagnumExternal/OpenGL/GL/flextGL.h.template
+++ b/src/MagnumExternal/OpenGL/GL/flextGL.h.template
@@ -14,7 +14,7 @@
 #error Attempt to include auto-generated header after including glext.h
 #endif
 #if defined(__gltypes_h_)
-#error Attempt to include auto-generated header after gltypes.h
+#error Attempt to include auto-generated header after including gltypes.h
 #endif
 #if defined(__gl_ATI_h_)
 #error Attempt to include auto-generated header after including glATI.h