1 files changed, 1 insertions, 0 deletions
diff --git a/util.c b/util.c
index 728f962..2780447 100644
--- a/util.c
+++ b/util.c
@@ -443,6 +443,7 @@ FILE *xfopen(const char *path, int flags) {
 		break;
 	default:
 		assert(!"Invalid access mode");
+		errno = EINVAL;
 		return NULL;
 	}