diff --git a/src/backend/replication/basebackup_gzip.c b/src/backend/replication/basebackup_gzip.c
index 1e58382fa08..b66d3da7a3f 100644
--- a/src/backend/replication/basebackup_gzip.c
+++ b/src/backend/replication/basebackup_gzip.c
@@ -66,6 +66,7 @@ bbsink_gzip_new(bbsink *next, int compresslevel)
 	ereport(ERROR,
 			(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 			 errmsg("gzip compression is not supported by this build")));
+	return NULL;				/* keep compiler quiet */
 #else
 	bbsink_gzip *sink;