Build local bundler on a "thread-safe folder"

1 files changed, 3 insertions, 3 deletions

diff --git a/spec/support/helpers.rb b/spec/support/helpers.rb
index dde8daaf6f..5af103a0e6 100644
--- a/spec/support/helpers.rb
+++ b/spec/support/helpers.rb
@@ -299,12 +299,12 @@ module Spec
     end
 
     def with_built_bundler
+      bundler_path = tmp + "bundler-#{Bundler::VERSION}.gem"
+
       with_root_gemspec do |gemspec|
-        gem_command! "build #{gemspec}", :dir => root
+        gem_command! "build #{gemspec} --output #{bundler_path}", :dir => root
       end
 
-      bundler_path = root + "bundler-#{Bundler::VERSION}.gem"
-
       begin
         yield(bundler_path)
       ensure