diff --git a/Library/Homebrew/dev-cmd/update-test.rb b/Library/Homebrew/dev-cmd/update-test.rb
index c2c6b0f60b..19050451fc 100644
--- a/Library/Homebrew/dev-cmd/update-test.rb
+++ b/Library/Homebrew/dev-cmd/update-test.rb
@@ -114,11 +114,14 @@ module Homebrew
       safe_system "brew", "update", "--verbose"
       actual_end_commit = Utils.popen_read("git", "rev-parse", branch).chomp
       if actual_end_commit != end_commit
+        start_log = Utils.popen_read("git", "log", "-1", "--decorate", "--oneline", start_commit).chomp
+        end_log = Utils.popen_read("git", "log", "-1", "--decorate", "--oneline", end_commit).chomp
+        actual_log = Utils.popen_read("git", "log", "-1", "--decorate", "--oneline", actual_end_commit).chomp
         raise <<~EOS
           brew update didn't update #{branch}!
-          Start commit:        #{start_commit}
-          Expected end commit: #{end_commit}
-          Actual end commit:   #{actual_end_commit}
+          Start commit:        #{start_log}
+          Expected end commit: #{end_log}
+          Actual end commit:   #{actual_log}
         EOS
       end
     end