diff --git a/src/interfaces/libpq/fe-exec.c b/src/interfaces/libpq/fe-exec.c
index a73630191b..25590f4d37 100644
--- a/src/interfaces/libpq/fe-exec.c
+++ b/src/interfaces/libpq/fe-exec.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.201 2009/05/21 12:54:27 meskes Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.202 2009/05/27 14:16:51 meskes Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2385,7 +2385,7 @@ PQresultStatus(const PGresult *res)
 char *
 PQresStatus(ExecStatusType status)
 {
-	if (status >= sizeof pgresStatus / sizeof pgresStatus[0])
+	if (status < 0 || status >= sizeof pgresStatus / sizeof pgresStatus[0])
 		return libpq_gettext("invalid ExecStatusType code");
 	return pgresStatus[status];
 }