diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
index 06ee202b37b..8dbfaff7674 100644
--- a/src/bin/pg_dump/pg_dump.c
+++ b/src/bin/pg_dump/pg_dump.c
@@ -15133,6 +15133,7 @@ getExtensionMembership(Archive *fout, ExtensionInfo extinfo[],
 		addObjectDependency(&contable->dataObj->dobj,
 							reftable->dataObj->dobj.dumpId);
 	}
+	PQclear(res);
 	destroyPQExpBuffer(query);
 }