diff --git a/pg_ivm.h b/pg_ivm.h
index 3ee0503..09fcba0 100644
--- a/pg_ivm.h
+++ b/pg_ivm.h
@@ -50,7 +50,6 @@ extern ObjectAddress ExecRefreshImmv(const RangeVar *relation, bool skipData,
 extern ObjectAddress RefreshImmvByOid(Oid matviewOid, bool skipData,
 									  const char *queryString, QueryCompletion *qc);
 extern bool ImmvIncrementalMaintenanceIsEnabled(void);
-extern Query *get_immv_query(Relation matviewRel);
 extern Datum IVM_immediate_before(PG_FUNCTION_ARGS);
 extern Datum IVM_immediate_maintenance(PG_FUNCTION_ARGS);
 extern Query* rewrite_query_for_exists_subquery(Query *query);