diff --git a/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/GridCacheUtils.java b/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/GridCacheUtils.java
index f4542aebb972c..45a00b7833a1c 100644
--- a/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/GridCacheUtils.java
+++ b/modules/core/src/main/java/org/apache/ignite/internal/processors/cache/GridCacheUtils.java
@@ -646,7 +646,7 @@ public static <T> IgniteReducer<Collection<T>, Collection<T>> collectionsReducer
 
             /** {@inheritDoc} */
             @Override public synchronized String toString() {
-                return "Collection reducer: " + ret;
+                return S.toString("Collection Reducer", "reducedElements", ret);
             }
         };
     }