diff --git a/js/app/services/fileservice.js b/js/app/services/fileservice.js
index 495869ef..1c7745e1 100644
--- a/js/app/services/fileservice.js
+++ b/js/app/services/fileservice.js
@@ -72,7 +72,7 @@
 					});
 				},
 				dataURItoBlob: function (dataURI, ftype) {
-					var byteString, mimeString, ab, ia, bb, i;
+					var byteString, ab, ia, bb, i;
 					// convert base64 to raw binary data held in a string
 					// doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
 					byteString = atob(dataURI.split(',')[1]);