diff --git a/libresonic-main/src/main/java/org/libresonic/player/controller/ChangeCoverArtController.java b/libresonic-main/src/main/java/org/libresonic/player/controller/ChangeCoverArtController.java
index f8ffa7f5..7206e5d1 100644
--- a/libresonic-main/src/main/java/org/libresonic/player/controller/ChangeCoverArtController.java
+++ b/libresonic-main/src/main/java/org/libresonic/player/controller/ChangeCoverArtController.java
@@ -19,6 +19,7 @@
  */
 package org.libresonic.player.controller;
 
+import org.apache.commons.lang.StringUtils;
 import org.libresonic.player.domain.MediaFile;
 import org.libresonic.player.service.MediaFileService;
 import org.springframework.beans.factory.annotation.Autowired;