diff --git a/curvefs/src/client/warmup/warmup_manager.h b/curvefs/src/client/warmup/warmup_manager.h
index 10cfdc60e0..7f68686a08 100644
--- a/curvefs/src/client/warmup/warmup_manager.h
+++ b/curvefs/src/client/warmup/warmup_manager.h
@@ -112,11 +112,10 @@ class WarmupProgress {
         total_ += add;
     }
 
-    WarmupProgress &&operator=(const WarmupProgress &wp) {
-        WarmupProgress ret;
-        ret.total_ = wp.total_;
-        ret.finished_ = wp.finished_;
-        return std::move(ret);
+    WarmupProgress& operator=(const WarmupProgress &wp) {
+        total_ = wp.total_;
+        finished_ = wp.finished_;
+        return this;
     }
 
     void FinishedPlusOne() {