diff --git a/src/interfaces/libpq/fe-exec.c b/src/interfaces/libpq/fe-exec.c
index 605d242..b6e6363 100644
--- a/src/interfaces/libpq/fe-exec.c
+++ b/src/interfaces/libpq/fe-exec.c
@@ -2386,7 +2386,7 @@ PQresultStatus(const PGresult *res)
 char *
 PQresStatus(ExecStatusType status)
 {
-	if (status < 0 || status >= sizeof pgresStatus / sizeof pgresStatus[0])
+	if (status < PGRES_EMPTY_QUERY || status >= sizeof pgresStatus / sizeof pgresStatus[0])
 		return libpq_gettext("invalid ExecStatusType code");
 	return pgresStatus[status];
 }