diff --git a/dbutil.c b/dbutil.c
index 830e8d2..e5c5a31 100644
--- a/dbutil.c
+++ b/dbutil.c
@@ -506,7 +506,7 @@ out:
 void m_close(int fd) {
 	int val;
 
-	if (fd == -1) {
+	if (fd < 0) {
 		return;
 	}