diff --git a/mingw-w64-headers/include/comutil.h b/mingw-w64-headers/include/comutil.h
index e090067..c3e2d47 100644
--- a/mingw-w64-headers/include/comutil.h
+++ b/mingw-w64-headers/include/comutil.h
@@ -7,6 +7,7 @@
 #define _INC_COMUTIL
 
 #include <ole2.h>
+#include <stdio.h>
 
 #ifndef _COM_ASSERT
 #define _COM_ASSERT(x) ((void)0)