diff --git a/src/imgio.c b/src/imgio.c
index 1739671..151315f 100644
--- a/src/imgio.c
+++ b/src/imgio.c
@@ -90,7 +90,7 @@ ppm_save(const unsigned int* buf, const PPM img)
 	if (!fptr)
 	{
 		free(dst_buf);
-		return 0;
+		return 10;
 	}
 
 	fprintf(fptr, "P%c\n%d %d\n255\n", img.fmt, img.width, img.height);