diff --git a/src/backend/catalog/partition.c b/src/backend/catalog/partition.c
index 59f2127..f17ac29 100644
--- a/src/backend/catalog/partition.c
+++ b/src/backend/catalog/partition.c
@@ -281,7 +281,7 @@ RelationBuildPartitionKey(Relation relation)
 	oidvector	   *opclass;
 	KeyTypeCollInfo *tcinfo;
 	ListCell	   *partexprbin_item;
-	List		   *partexprsrc;
+	List		   *partexprsrc = NIL;
 	ListCell	   *partexprsrc_item;
 	Datum			datum;
 	MemoryContext	partkeycxt,