diff --git a/zsnes/src/patch.c b/zsnes/src/patch.c
index 905cc5ae..60a31601 100644
--- a/zsnes/src/patch.c
+++ b/zsnes/src/patch.c
@@ -244,7 +244,7 @@ void PatchUsingIPS()
   {
     FILE *fp = 0;
     fp = fopen("zsnes.rom", "wb");
-    if (!fp) { asm volatile("int $3"); }
+    if (!fp) { perror(0); asm volatile("int $3"); }
     fwrite(ROM, 1, curromspace, fp);
     fclose(fp);
   }