diff --git a/doc/en/Makefile b/doc/en/Makefile
index fa8e8266a..f93d84557 100644
--- a/doc/en/Makefile
+++ b/doc/en/Makefile
@@ -39,7 +39,7 @@ clean:
 	-rm -rf $(BUILDDIR)/*
 
 regen:
-	PYTHONDONTWRITEBYTECODE=1 PYTEST_ADDOPT=-pno:hypothesis COLUMNS=76 regendoc --update *.rst */*.rst ${REGENDOC_ARGS}
+	PYTHONDONTWRITEBYTECODE=1 PYTEST_ADDOPTS=-pno:hypothesis COLUMNS=76 regendoc --update *.rst */*.rst ${REGENDOC_ARGS}
 
 html:
 	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html