diff --git a/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java b/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
index ae2daeddf5..acc329c399 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java
@@ -344,7 +344,7 @@ public abstract class DruidAbstractDataSource extends WrapperAdapter implements
     }
 
     public void setUseUnfairLock(boolean useUnfairLock) {
-        if (lock.isFair() == !useUnfairLock) {
+        if (lock.isFair() == !useUnfairLock&&this.useUnfairLock!=null) {
             return;
         }