diff --git a/index.rst b/index.rst
index 063dced4a1..e89d90ada8 100644
--- a/index.rst
+++ b/index.rst
@@ -29,7 +29,7 @@ instructions please see the :ref:`setup guide <setup>`.
 
 3. Build Python, on UNIX and macOS use::
 
-      ./configure --with-pydebug && make -j
+      ./configure --with-pydebug && make -j4
 
    and on Windows use: