diff --git a/Common/Common.h b/Common/Common.h
index 5f1d795242..28f7d51773 100644
--- a/Common/Common.h
+++ b/Common/Common.h
@@ -21,6 +21,7 @@
 // DO NOT EVER INCLUDE <windows.h> directly _or indirectly_ from this file
 // since it slows down the build a lot.
 
+#include <stdlib.h>
 #include <stdarg.h>
 
 #ifdef _MSC_VER