diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index 79030e7715..a44112befc 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -1358,6 +1358,7 @@ gistfinishsplit(GISTInsertState *state, GISTInsertStack *stack,
 			 * If the parent page was split, need to relocate the original
 			 * parent pointer.
 			 */
+			stack->downlinkoffnum = InvalidOffsetNumber;
 			gistFindCorrectParent(state->r, stack);
 		}
 		/* gistinserttuples() released the lock on right->buf. */