diff --git a/src/common/backend/utils/cache/lsyscache.cpp b/src/common/backend/utils/cache/lsyscache.cpp
index ffecd6dc5bf1625e3fe6da24fe85c132c4e4adf0..8f8a49e10816b4cbb08e687fd553efe9f58174ae 100644
--- a/src/common/backend/utils/cache/lsyscache.cpp
+++ b/src/common/backend/utils/cache/lsyscache.cpp
@@ -4654,6 +4654,9 @@ Oid get_typcollation(Oid typid)
             return DEFAULT_COLLATION_OID;
         } break;
         default: {
+            if (type_is_enum(typid)) {
+                return DEFAULT_COLLATION_OID;
+            }
             HeapTuple tp;
             tp = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typid));
             if (HeapTupleIsValid(tp)) {