diff --git a/modules/core/src/main/java/org/apache/ignite/internal/util/GridLongList.java b/modules/core/src/main/java/org/apache/ignite/internal/util/GridLongList.java
index 09fb0983d3462..d1f20e634a03c 100644
--- a/modules/core/src/main/java/org/apache/ignite/internal/util/GridLongList.java
+++ b/modules/core/src/main/java/org/apache/ignite/internal/util/GridLongList.java
@@ -530,7 +530,7 @@ public void pop(int cnt) {
 
         switch (writer.state()) {
             case 0:
-                if (!writer.writeLongArray("arr", arr))
+                if (!writer.writeLongArray("arr", arr, idx))
                     return false;
 
                 writer.incrementState();