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-rw-r--r--lib/rubygems/source/git.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rubygems/source/git.rb b/lib/rubygems/source/git.rb
index cda5aa8073..8d5dc1f69d 100644
--- a/lib/rubygems/source/git.rb
+++ b/lib/rubygems/source/git.rb
@@ -102,6 +102,7 @@ class Gem::Source::Git < Gem::Source
success = system @git, 'reset', '--quiet', '--hard', rev_parse
if @need_submodules
+ require "open3"
_, status = Open3.capture2e(@git, 'submodule', 'update', '--quiet', '--init', '--recursive')
success &&= status.success?