diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 1b8f0ae597..c1ba3197b2 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -1988,6 +1988,19 @@ pg_get_functiondef(PG_FUNCTION_ARGS)
 		case PROVOLATILE_VOLATILE:
 			break;
 	}
+
+	switch (proc->proparallel)
+	{
+		case PROPARALLEL_SAFE:
+			appendStringInfoString(&buf, " PARALLEL SAFE");
+			break;
+		case PROPARALLEL_RESTRICTED:
+			appendStringInfoString(&buf, " PARALLEL RESTRICTED");
+			break;
+		case PROPARALLEL_UNSAFE:
+			break;
+	}
+
 	if (proc->proisstrict)
 		appendStringInfoString(&buf, " STRICT");
 	if (proc->prosecdef)