diff --git a/dlls/uxtheme/msstyles.c b/dlls/uxtheme/msstyles.c
index c3b3ce6456e..77af7087c9e 100644
--- a/dlls/uxtheme/msstyles.c
+++ b/dlls/uxtheme/msstyles.c
@@ -21,6 +21,7 @@
 #include "config.h"
 
 #include <stdarg.h>
+#include <stdlib.h>
 
 #include "windef.h"
 #include "winbase.h"