diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4504b29432c..e02e9ade1ae 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -90,8 +90,10 @@ jobs:
           if test -n "$changes"; then
             echo "Generated files not up to date."
             echo "Perhaps you forgot to run make regen-all or build.bat --regen. ;)"
-            echo "configure files must be regenerated with a specific, unpatched version of autoconf."
+            echo "configure files must be regenerated with a specific version of autoconf."
             echo "$changes"
+            echo ""
+            git diff --staged || true
             exit 1
           fi
       - name: Check exported libpython symbols