diff --git a/doc/Makefile b/doc/Makefile
index b9adacb70898e0ec265ebb296c3ee334a730c549..ba9bf0086407362722fe477116e3c7f355ca7a3d 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -31,6 +31,7 @@ clean:
 	-rm -rf $(BUILDDIR)/*
 	-rm -rf auto_examples/
 	-rm -rf doc/generated/*
+	-rm -rf modules/generated/*
 
 html:
 	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html