diff --git a/dubbo-common/src/main/java/org/apache/dubbo/common/timer/HashedWheelTimer.java b/dubbo-common/src/main/java/org/apache/dubbo/common/timer/HashedWheelTimer.java
index d695b46d169..487cc74ba5c 100644
--- a/dubbo-common/src/main/java/org/apache/dubbo/common/timer/HashedWheelTimer.java
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/timer/HashedWheelTimer.java
@@ -805,8 +805,10 @@ private HashedWheelTimeout pollTimeout() {
             return head;
         }
     }
-
+    
+    private static final boolean IS_OS_WINDOWS = System.getProperty("os.name", "").toLowerCase(Locale.US).contains("win");
+    
     private boolean isWindows() {
-        return System.getProperty("os.name", "").toLowerCase(Locale.US).contains("win");
+    	return IS_OS_WINDOWS;
     }
 }