diff --git a/Library/Homebrew/dev-cmd/tests.rb b/Library/Homebrew/dev-cmd/tests.rb
index 0ef2bb0141..f93f8e4ed2 100644
--- a/Library/Homebrew/dev-cmd/tests.rb
+++ b/Library/Homebrew/dev-cmd/tests.rb
@@ -86,7 +86,7 @@ module Homebrew
         ENV["GIT_#{role}_DATE"]  = "Sun Jan 22 19:59:13 2017 +0000"
       end
 
-      Homebrew.install_gem_setup_path! "bundler"
+      Homebrew.install_gem_setup_path! "bundler", "<2"
       system "bundle", "install" unless quiet_system("bundle", "check")
 
       parallel = true
diff --git a/Library/Homebrew/dev-cmd/vendor-gems.rb b/Library/Homebrew/dev-cmd/vendor-gems.rb
index a902de4c75..f43887015a 100644
--- a/Library/Homebrew/dev-cmd/vendor-gems.rb
+++ b/Library/Homebrew/dev-cmd/vendor-gems.rb
@@ -17,7 +17,7 @@ module Homebrew
       switch :debug
     end.parse
 
-    Homebrew.install_gem_setup_path! "bundler"
+    Homebrew.install_gem_setup_path! "bundler", "<2"
 
     ohai "cd #{HOMEBREW_LIBRARY_PATH}/vendor"
     (HOMEBREW_LIBRARY_PATH/"vendor").cd do