diff --git a/src/allreduce_base.h b/src/allreduce_base.h
index 41b9f35f2..2d75da684 100644
--- a/src/allreduce_base.h
+++ b/src/allreduce_base.h
@@ -65,7 +65,7 @@ class AllreduceBase : public IEngine {
   }
   /*! \brief whether is distributed or not */
   virtual bool IsDistributed(void) const {
-    return tracker_uri == "NULL";
+    return tracker_uri != "NULL";
   }
   /*! \brief get rank */
   virtual std::string GetHost(void) const {