diff --git a/appDefinition.json b/appDefinition.json
index dacfaa4..e471ba8 100644
--- a/appDefinition.json
+++ b/appDefinition.json
@@ -11,7 +11,7 @@
   "inputParameters" : [ ],
   "outputs" : [ {
     "dataType" : "eff_drop_out_aux_image",
-    "fileName" : "Figure1.png",
+    "fileName" : "Figure1.mat",
     "isReturnedValue" : false
   } ],
   "requiredTools" : [ "matlab" ],