diff --git a/library/src/main/java/com/qiniu/android/http/request/httpclient/SystemHttpClient.java b/library/src/main/java/com/qiniu/android/http/request/httpclient/SystemHttpClient.java
index 8bf27cf5..4ae5b74a 100644
--- a/library/src/main/java/com/qiniu/android/http/request/httpclient/SystemHttpClient.java
+++ b/library/src/main/java/com/qiniu/android/http/request/httpclient/SystemHttpClient.java
@@ -15,7 +15,6 @@
 import com.qiniu.android.utils.StringUtils;
 
 
-import org.jetbrains.annotations.NotNull;
 import org.json.JSONObject;
 
 import java.io.IOException;