diff --git a/src/main/java/com/alibaba/druid/filter/config/ConfigFilter.java b/src/main/java/com/alibaba/druid/filter/config/ConfigFilter.java
index 4517a240bc..e184aa7912 100644
--- a/src/main/java/com/alibaba/druid/filter/config/ConfigFilter.java
+++ b/src/main/java/com/alibaba/druid/filter/config/ConfigFilter.java
@@ -20,7 +20,6 @@ import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.InputStream;
 import java.net.URL;
-import java.net.UnknownHostException;
 import java.security.PublicKey;
 import java.sql.SQLException;
 import java.util.Properties;