diff --git a/Makefile b/Makefile
index d4bb2cbb9eddb1bb1b4f366623044af8e4830919..0dd9aa644265188b43b6bb2d67341e3d4a449fab 100644
--- a/Makefile
+++ b/Makefile
@@ -17,4 +17,4 @@ help:
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile
-	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+	@$(SPHINXBUILD) -j auto -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)