diff --git a/Library/Homebrew/cmd/update-reset.sh b/Library/Homebrew/cmd/update-reset.sh
index 32daffc96e4cf5ea83efe5d9cef3b1a1b1ff7481..3a9e1caa939a189dc8ba7c135701047190bf0468 100644
--- a/Library/Homebrew/cmd/update-reset.sh
+++ b/Library/Homebrew/cmd/update-reset.sh
@@ -37,7 +37,7 @@ EOS
     echo
 
     echo "==> Resetting $DIR..."
-    git checkout -B master origin/master
+    git checkout --force -B master origin/master
     echo
   done
 }