diff --git a/lucene/core/src/test/org/apache/lucene/util/TestTimSorter.java b/lucene/core/src/test/org/apache/lucene/util/TestTimSorter.java
index 556a5c84f98..2879b0e463d 100644
--- a/lucene/core/src/test/org/apache/lucene/util/TestTimSorter.java
+++ b/lucene/core/src/test/org/apache/lucene/util/TestTimSorter.java
@@ -129,7 +129,7 @@ public class TestTimSorter extends BaseSortTestCase {
       Y += X + 1;
     }
 
-    if(runningTotal + X <= length) {
+    if((long) runningTotal + X <= length) {
       runningTotal += X;
       generateWrongElem(X, minRun, runs);
     }