diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 10cc0e6..7a43231 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -3362,7 +3362,9 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
 	int			port = LDAP_DEF_PORT,
 				scope,
 				rc,
+#ifndef WIN32
 				msgid,
+#endif
 				size,
 				state,
 				oldstate,