diff --git a/src/main/java/com/alibaba/druid/pool/DruidDataSource.java b/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
index a2beb6a9c6..37be21883e 100644
--- a/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
+++ b/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
@@ -428,6 +428,8 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
             }
 
             if (count == 0) {
+                lowWater.signal();
+                
                 notEmpty.awaitNanos(nanos);
 
                 if (count == 0) {