diff --git a/Makefile b/Makefile
index b50041d2b017..c5954acc751c 100644
--- a/Makefile
+++ b/Makefile
@@ -24,7 +24,7 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
+SPHINXOPTS    = -j auto
 SPHINXBUILD   = sphinx-build
 SPHINXPROJ    = QGIS
 QGISVERSION   = master