diff --git a/wise-webapp/src/main/webapp/jsp/mindmapImport.jsp b/wise-webapp/src/main/webapp/jsp/mindmapImport.jsp
index f7858b25..a551ed03 100644
--- a/wise-webapp/src/main/webapp/jsp/mindmapImport.jsp
+++ b/wise-webapp/src/main/webapp/jsp/mindmapImport.jsp
@@ -106,7 +106,7 @@
         });
 
         // Read in the image file as a data URL.
-        reader.readAsBinaryString(file);
+        reader.readAsText(file);
     });
 
     // Hook for interaction with the main parent window ...