diff --git a/src/gui.c b/src/gui.c
index 8cd43ac..090160a 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -4359,7 +4359,7 @@
 {
     if (STRLEN(name) > MAXPATHL - 14)
 	return FAIL;
-    sprintf((char *)buffer, "bitmaps/%s.%s", name, ext);
+    vim_snprintf((char *)buffer, MAXPATHL, "bitmaps/%s.%s", name, ext);
     if (do_in_runtimepath(buffer, FALSE, gfp_setname, buffer) == FAIL
 							    || *buffer == NUL)
 	return FAIL;