diff --git a/src/com/interview/graph/BinaryMinHeap.java b/src/com/interview/graph/BinaryMinHeap.java
index 2b669661..c133eb26 100644
--- a/src/com/interview/graph/BinaryMinHeap.java
+++ b/src/com/interview/graph/BinaryMinHeap.java
@@ -121,7 +121,7 @@ public Node extractMinNode() {
         allNodes.get(0).weight = lastNodeWeight;
         allNodes.get(0).key = allNodes.get(size).key;
         nodePosition.remove(minNode.key);
-        nodePosition.remove(allNodes.get(0));
+        nodePosition.remove(allNodes.get(0).key);
         nodePosition.put(allNodes.get(0).key, 0);
         allNodes.remove(size);