diff --git a/Magick++/lib/Magick++/Include.h b/Magick++/lib/Magick++/Include.h
index 9bf3c8b2a3..a7837dab77 100644
--- a/Magick++/lib/Magick++/Include.h
+++ b/Magick++/lib/Magick++/Include.h
@@ -32,7 +32,7 @@
 #include <errno.h>
 #include <stdint.h>
 
-void* operator new(std::size_t, void*) throw();
+void* operator new(size_t, void*) throw();
 
 //
 // Include ImageMagick headers into namespace "MagickCore". If