diff --git a/docs/Makefile b/docs/Makefile
index 803b51e0e..9e41b7474 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -68,7 +68,7 @@ html:
 
 .PHONY: rtdhtml
 rtdhtml: 
-	$(SPHINXBUILD) -T -j auto -E -W --keep-going -b html -d $(BUILDDIR)/doctrees -D language=en . $(BUILDDIR)/html
+	$(SPHINXBUILD) -T -E -W --keep-going -b html -d $(BUILDDIR)/doctrees -D language=en . $(BUILDDIR)/html
 	@echo
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."