diff --git a/Library/Homebrew/cmd/update.rb b/Library/Homebrew/cmd/update.rb
index 599a9998c79a..c225b917616c 100644
--- a/Library/Homebrew/cmd/update.rb
+++ b/Library/Homebrew/cmd/update.rb
@@ -42,7 +42,7 @@ def update_from_masterbrew!
         begin
           safe_system "git init"
           safe_system "git fetch #{REPOSITORY_URL}"
-          safe_system "git reset FETCH_HEAD"
+          safe_system "git reset --soft FETCH_HEAD"
         rescue Exception
           safe_system "rm -rf .git"
           raise