diff --git a/processing/src/main/java/org/apache/druid/query/groupby/GroupByQueryConfig.java b/processing/src/main/java/org/apache/druid/query/groupby/GroupByQueryConfig.java
index dbd6f2869a75..23ef9fae820f 100644
--- a/processing/src/main/java/org/apache/druid/query/groupby/GroupByQueryConfig.java
+++ b/processing/src/main/java/org/apache/druid/query/groupby/GroupByQueryConfig.java
@@ -370,7 +370,7 @@ public GroupByQueryConfig withOverrides(final GroupByQuery query)
         isMultiValueUnnestingEnabled()
     );
 
-    logger.debug("Override config for GroupBy query %s - %s", query.getId(), newConfig.toString());
+    logger.debug("Override config for GroupBy query %s - %s", query.getId(), newConfig);
     return newConfig;
   }