diff --git a/server/src/main/java/org/apache/druid/server/ClientQuerySegmentWalker.java b/server/src/main/java/org/apache/druid/server/ClientQuerySegmentWalker.java
index c3379bab021..fa35ff7b8a9 100644
--- a/server/src/main/java/org/apache/druid/server/ClientQuerySegmentWalker.java
+++ b/server/src/main/java/org/apache/druid/server/ClientQuerySegmentWalker.java
@@ -274,8 +274,7 @@ public class ClientQuerySegmentWalker implements QuerySegmentWalker
           current = Iterables.getOnlyElement(current.getChildren());
         }
 
-        assert !(current instanceof QueryDataSource);
-
+        assert !(current instanceof QueryDataSource); // lgtm [java/contradictory-type-checks]
         current = inlineIfNecessary(current, null, subqueryRowLimitAccumulator, maxSubqueryRows, dryRun);
 
         while (!stack.isEmpty()) {