diff --git a/widget/gtk/nsFilePicker.cpp b/widget/gtk/nsFilePicker.cpp
index bd4856be54..05d8bb0f0b 100644
--- a/widget/gtk/nsFilePicker.cpp
+++ b/widget/gtk/nsFilePicker.cpp
@@ -465,9 +465,8 @@ nsFilePicker::Open(nsIFilePickerShownCallback *aCallback)
     }
   }
 
-  // Default to cancelling the operation.
   if (GTK_IS_DIALOG(file_chooser)) {
-    gtk_dialog_set_default_response(GTK_DIALOG(file_chooser), GTK_RESPONSE_CANCEL);
+    gtk_dialog_set_default_response(GTK_DIALOG(file_chooser), GTK_RESPONSE_ACCEPT);
   }
 
   int32_t count = mFilters.Length();