diff --git a/src/backend/distributed/transaction/distributed_deadlock_detection.c b/src/backend/distributed/transaction/distributed_deadlock_detection.c
index 0bf60c58d..a2d847964 100644
--- a/src/backend/distributed/transaction/distributed_deadlock_detection.c
+++ b/src/backend/distributed/transaction/distributed_deadlock_detection.c
@@ -134,7 +134,7 @@ CheckForDistributedDeadlocks(void)
 	{
 		bool deadlockFound = false;
 		List *deadlockPath = NIL;
-		TransactionNode *transactionNodeStack[edgeCount];
+		TransactionNode *transactionNodeStack[edgeCount + 1];
 
 		/* we're only interested in finding deadlocks originating from this node */
 		if (transactionNode->transactionId.initiatorNodeIdentifier != localGroupId)