diff --git a/app/elements/file-sharing/file-button-behavior.html b/app/elements/file-sharing/file-button-behavior.html
index 3c81e65..9dc20f6 100644
--- a/app/elements/file-sharing/file-button-behavior.html
+++ b/app/elements/file-sharing/file-button-behavior.html
@@ -28,6 +28,7 @@ Chat.FileButtonBehaviorImpl = {
         'tap': '_openDialog'
     },
     _openDialog: function() {
+        this.fileInput.value = null;
         this.fileInput.click();
     }
 };