diff --git a/src/xpdev/genwrap.c b/src/xpdev/genwrap.c
index 5ecaae91e3cc5f52eb1415f5d309d3802fedb80c..4e5094452d18e0f6613fc9c32d46a72c5956afcd 100644
--- a/src/xpdev/genwrap.c
+++ b/src/xpdev/genwrap.c
@@ -67,7 +67,7 @@
 /****************************************************************************/
 /* Used to replace snprintf()  guarantees to terminate.			  			*/
 /****************************************************************************/
-int DLLCALL safe_snprintf(char *dst, size_t size, char *fmt, ...)
+int DLLCALL safe_snprintf(char *dst, size_t size, const char *fmt, ...)
 {
 	va_list argptr;
 	int     numchars;
diff --git a/src/xpdev/genwrap.h b/src/xpdev/genwrap.h
index 70f9eac595a291dffc0867901f58da5ae2b1dffd..c9f1c27376a5b14aa73ccd9acba584d26262278a 100644
--- a/src/xpdev/genwrap.h
+++ b/src/xpdev/genwrap.h
@@ -272,7 +272,7 @@ extern "C" {
 DLLEXPORT int		DLLCALL	xp_random(int);
 DLLEXPORT char*		DLLCALL os_version(char *str);
 DLLEXPORT char*		DLLCALL	lastchar(const char* str);
-DLLEXPORT int		DLLCALL safe_snprintf(char *dst, size_t size, char *fmt, ...);
+DLLEXPORT int		DLLCALL safe_snprintf(char *dst, size_t size, const char *fmt, ...);
 
 #if defined(_WIN32)
 #define		msclock()	clock()