diff --git a/src/interfaces/libpq/fe-protocol3.c b/src/interfaces/libpq/fe-protocol3.c
index 4cef2b4eb7..28318f0069 100644
--- a/src/interfaces/libpq/fe-protocol3.c
+++ b/src/interfaces/libpq/fe-protocol3.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol3.c,v 1.42 2010/01/15 09:19:10 heikki Exp $
+ *	  $PostgreSQL: pgsql/src/interfaces/libpq/fe-protocol3.c,v 1.43 2010/04/28 13:46:23 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1909,7 +1909,7 @@ build_startup_packet(const PGconn *conn, char *packet,
 		ADD_STARTUP_OPTION("user", conn->pguser);
 	if (conn->dbName && conn->dbName[0])
 		ADD_STARTUP_OPTION("database", conn->dbName);
-	if (conn->replication && conn->replication)
+	if (conn->replication && conn->replication[0])
 		ADD_STARTUP_OPTION("replication", conn->replication);
 	if (conn->pgoptions && conn->pgoptions[0])
 		ADD_STARTUP_OPTION("options", conn->pgoptions);