diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8e86026..8f8117e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -78,7 +78,7 @@ jobs:
         - ruby: "head"
           gemfile: gemfiles/rails_head.gemfile
     env:
-      BUNDLE_GEMFILE: ${{ github.workspace }}/${{ matrix.gemfile }}
+      BUNDLE_GEMFILE: ${{ matrix.gemfile }}
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
diff --git a/gemfiles/rails_head.gemfile b/gemfiles/rails_head.gemfile
index 95e43f4..a0c6acd 100644
--- a/gemfiles/rails_head.gemfile
+++ b/gemfiles/rails_head.gemfile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-# $ BUNDLE_GEMFILE="$(pwd)/gemfiles/rails_git.gemfile" bundle exec m test/integration/tasks_test.rb:50
+# $ BUNDLE_GEMFILE="gemfiles/rails_git.gemfile" bundle exec m test/integration/tasks_test.rb:50
 
 source "https://rubygems.org"
 
diff --git a/test/integration/tasks_test.rb b/test/integration/tasks_test.rb
index bb980a6..2a5ecee 100644
--- a/test/integration/tasks_test.rb
+++ b/test/integration/tasks_test.rb
@@ -26,7 +26,11 @@ def rake(cmd, options = {})
     env_string = env.map {|key, value| "#{key.shellescape}=#{value.to_s.shellescape}" }.join(" ")
     cmd        = "env #{env_string} bundle exec rake -f perf.rake #{cmd} --trace"
     puts "Running: #{cmd}"
-    result = Bundler.with_original_env { `cd '#{rails_app_path}' && #{cmd} 2>&1` }
+    result = Bundler.with_original_env do
+      # Ensure relative BUNDLE_GEMFILE is expanded so path is still correct after cd
+      ENV['BUNDLE_GEMFILE'] = File.expand_path(ENV['BUNDLE_GEMFILE']) if ENV['BUNDLE_GEMFILE']
+      `cd '#{rails_app_path}' && #{cmd} 2>&1` 
+    end
     if assert_success && !$?.success?
       puts result
       raise "Expected '#{cmd}' to return a success status.\nOutput: #{result}"
@@ -44,7 +48,7 @@ def rake(cmd, options = {})
   end
 
   test 'rails perf:library from git' do
-    # BUNDLE_GEMFILE="$(pwd)/gemfiles/rails_git.gemfile" bundle exec m test/integration/tasks_test.rb:<linenumber>
+    # BUNDLE_GEMFILE="gemfiles/rails_git.gemfile" bundle exec m test/integration/tasks_test.rb:<linenumber>
 
     skip # unless ENV['USING_RAILS_GIT']
 
@@ -54,7 +58,7 @@ def rake(cmd, options = {})
   end
 
   test "rails perf:library with bad script" do
-    # BUNDLE_GEMFILE="$(pwd)/gemfiles/rails_git.gemfile" bundle exec m test/integration/tasks_test.rb:<linenumber>
+    # BUNDLE_GEMFILE="gemfiles/rails_git.gemfile" bundle exec m test/integration/tasks_test.rb:<linenumber>
 
     skip # unless ENV['USING_RAILS_GIT']