diff --git a/.github/workflows/make.yml b/.github/workflows/make.yml
index fbd98d497..ed12cf5a8 100644
--- a/.github/workflows/make.yml
+++ b/.github/workflows/make.yml
@@ -77,7 +77,7 @@ jobs:
 
       - name: Compare to previous hpmor.html
         run: |
-          diff -u hpmor-prev.html hpmor.html > hpmor-html-diff.log || :
+          diff -u -s hpmor-prev.html hpmor.html > hpmor-html-diff.log || :
           rm hpmor-prev.html
 
       - name: Test ls after