diff --git a/ci/ci_build.rb b/ci/ci_build.rb
index 049f7b7975678..7d9cf679e2595 100755
--- a/ci/ci_build.rb
+++ b/ci/ci_build.rb
@@ -14,7 +14,7 @@
 
 # for now, use the no-passwd sudoers approach (documented in ci_setup_notes.txt)
 # A security hole, but there is nothing valuable on rails CI box anyway.
-build_results[:geminstaller] = system 'sudo geminstaller --exceptions'
+build_results[:geminstaller] = system 'sudo geminstaller --config=#{root_dir}/ci/geminstaller.yml --exceptions'
 
 cd "#{root_dir}/activesupport" do
   puts