diff --git a/doc/en/Makefile b/doc/en/Makefile
index cc06178f4..826ac61cb 100644
--- a/doc/en/Makefile
+++ b/doc/en/Makefile
@@ -39,8 +39,9 @@ help:
 clean:
 	-rm -rf $(BUILDDIR)/*
 
+regen: REGENDOC_FILES:=*.rst */*.rst
 regen:
-	PYTHONDONTWRITEBYTECODE=1 PYTEST_ADDOPTS=-pno:hypothesis COLUMNS=76 regendoc --update *.rst */*.rst ${REGENDOC_ARGS}
+	PYTHONDONTWRITEBYTECODE=1 PYTEST_ADDOPTS=-pno:hypothesis COLUMNS=76 regendoc --update ${REGENDOC_FILES} ${REGENDOC_ARGS}
 
 html:
 	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html