diff --git a/.github/workflows/check_misc.yml b/.github/workflows/check_misc.yml
index d4a2c6f3fef6eb..7c745acf568202 100644
--- a/.github/workflows/check_misc.yml
+++ b/.github/workflows/check_misc.yml
@@ -29,17 +29,24 @@ jobs:
           checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
 
       # Run this step first to make sure auto-style commits are pushed
-      - name: ${{ github.ref == 'refs/heads/master' && 'Auto-correct' || 'Check for' }} code styles
+      - name: Auto-correct code styles
         run: |
           set -x
-          ruby tool/auto-style.rb "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA" "$PUSH_REF"
+          ruby tool/auto-style.rb "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA" refs/heads/master
         env:
-          EMAIL: svn-admin@ruby-lang.org
+          GITHUB_OLD_SHA: ${{ github.event.before }}
+          GITHUB_NEW_SHA: ${{ github.event.after }}
           GIT_AUTHOR_NAME: git
           GIT_COMMITTER_NAME: git
+          EMAIL: svn-admin@ruby-lang.org
+        if: ${{ github.repository == 'ruby/ruby' && github.ref == 'refs/heads/master' && github.event_name == 'push' }}
+      - name: Check for code styles
+        run: |
+          set -x
+          ruby tool/auto-style.rb "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA"
+        env:
           GITHUB_OLD_SHA: ${{ github.event.pull_request.base.sha }}
           GITHUB_NEW_SHA: ${{ github.event.pull_request.merge_commit_sha }}
-          PUSH_REF: ${{ github.ref == 'refs/heads/master' && github.ref || '' }}
         if: ${{ github.repository == 'ruby/ruby' && startsWith(github.event_name, 'pull') }}
 
       - name: Check if C-sources are US-ASCII
diff --git a/libexec/erb b/libexec/erb
index a1fb7457585d9b..de7d5888c346e8 100755
--- a/libexec/erb
+++ b/libexec/erb
@@ -132,7 +132,7 @@ Filepaths:
 
   If no filepaths are given, the sole input is the standard input.
 
-See details and examples at https://docs.ruby-lang.org/en/master/erb_executable_md.html  
+See details and examples at https://docs.ruby-lang.org/en/master/erb_executable_md.html
 EOU
         exit 1
       end
diff --git a/tool/auto-style.rb b/tool/auto-style.rb
index 259ed377bc7036..3b93c8c3179291 100755
--- a/tool/auto-style.rb
+++ b/tool/auto-style.rb
@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 # Usage:
-#   auto-style.rb [oldrev] [newrev] [pushref]
+#   auto-style.rb oldrev newrev [pushref]
 
 require 'shellwords'
 require 'tmpdir'
@@ -71,9 +71,9 @@ def diff
   private
 
   def git(*args, **opts)
-    cmd = ['git', *args].shelljoin
-    puts "+ #{cmd}"
-    ret = with_clean_env { system('git', *args, **opts) }
+    cmd = ['git', *args]
+    puts "+ #{cmd.shelljoin}"
+    ret = with_clean_env { system(*cmd, **opts) }
     unless ret or opts[:err]
       abort "Failed to run: #{cmd}"
     end
@@ -251,7 +251,7 @@ def adjust_styles(files)
   _, *updated_files = ARGV
   git = Git.new(nil, nil)
 else
-  unless dry_run = pushref.empty?
+  unless dry_run = pushref.nil?
     branch = IO.popen(['git', 'rev-parse', '--symbolic', '--abbrev-ref', pushref], &:read).strip
   end
   git = Git.new(oldrev, newrev, branch)