diff --git a/common/src/main/java/ctbrec/io/UrlUtil.java b/common/src/main/java/ctbrec/io/UrlUtil.java
index 558b591e..142be791 100644
--- a/common/src/main/java/ctbrec/io/UrlUtil.java
+++ b/common/src/main/java/ctbrec/io/UrlUtil.java
@@ -7,6 +7,7 @@ import java.net.URISyntaxException;
 import java.net.URL;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
+import java.util.Map;
 
 import ctbrec.Config;
 import ctbrec.Hmac;