diff --git a/python-sphinx_rtd_theme.spec b/python-sphinx_rtd_theme.spec
index 0f628ea..d3a8aba 100644
--- a/python-sphinx_rtd_theme.spec
+++ b/python-sphinx_rtd_theme.spec
@@ -140,9 +140,10 @@ rm docs/build/html/.buildinfo
 %endif
 
 # Test that the forbidden fonts were successfully removed from the css files
-! grep 'format("woff2\?")' \
+grep 'format("woff2\?")' \
   %{buildroot}%{python3_sitelib}/%{srcname}/static/css/badge_only.css \
-  %{buildroot}%{python3_sitelib}/%{srcname}/static/css/theme.css
+  %{buildroot}%{python3_sitelib}/%{srcname}/static/css/theme.css \
+&& exit 1 || true
 
 %files -n python%{python3_pkgversion}-%{srcname}
 %doc README.html