diff --git a/sc2/src/sc2code/sis.c b/sc2/src/sc2code/sis.c
index 493504ad5..0d3451db0 100644
--- a/sc2/src/sc2code/sis.c
+++ b/sc2/src/sc2code/sis.c
@@ -26,6 +26,7 @@
 #include "libs/graphics/gfx_common.h"
 #include "libs/tasklib.h"
 
+#include <stdio.h>
 
 static const UNICODE *describeWeapon (BYTE moduleType);