diff --git a/testfiles/support/fduthesis-regression-test.tex b/testfiles/support/fduthesis-regression-test.tex
index b621c30..4f5e5aa 100644
--- a/testfiles/support/fduthesis-regression-test.tex
+++ b/testfiles/support/fduthesis-regression-test.tex
@@ -2,7 +2,9 @@
 
 \input{regression-test}
 
-\RequirePackage{expl3}
+\ExplSyntaxOn
+\debug_on:n { check-declarations }
+\ExplSyntaxOff
 
 \def\MAKECOVERFALSE{%
   \fdusetup{style/auto-make-cover = false}}