diff --git a/src/AbstractImage.cpp b/src/AbstractImage.cpp
index 19ffdc1f4..d7b4373e4 100644
--- a/src/AbstractImage.cpp
+++ b/src/AbstractImage.cpp
@@ -115,6 +115,7 @@ std::size_t AbstractImage::pixelSize(Format format, Type type) {
             CORRADE_INTERNAL_ASSERT(false);
     }
 
+    CORRADE_INTERNAL_ASSERT(false);
     return 0;
 }