diff --git a/core/src/main/java/com/alibaba/druid/pool/DruidDataSource.java b/core/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
index bd288b894..144b3f5be 100644
--- a/core/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
+++ b/core/src/main/java/com/alibaba/druid/pool/DruidDataSource.java
@@ -3201,7 +3201,9 @@ public class DruidDataSource extends DruidAbstractDataSource
             lock.lock();
             try {
                 int fillCount = minIdle - (activeCount + poolingCount + createTaskCount);
-                emptySignal(fillCount);
+                if (fillCount > 0) {
+                    emptySignal(fillCount);
+                }
             } finally {
                 lock.unlock();
             }