diff --git a/run-tests.py b/run-tests.py
index f585b70..d9ffa75 100755
--- a/run-tests.py
+++ b/run-tests.py
@@ -85,7 +85,7 @@ def run_alltests(python='python', fast=False, skip_setup=False):
             '{python} -m {pycodestyle} postpic --statistics --count --show-source '
             '--ignore=W391,E123,E226,E24,W504 --max-line-length=99',
             '{python} -m nose2 -B']
-    cmdo = ['{python} setup.py build_sphinx',
+    cmdo = ['make -C doc/ html',
             '{python} ' + os.path.join('examples', 'simpleexample.py'),
             '{python} ' + os.path.join('examples', 'particleshapedemo.py'),
             '{python} ' + os.path.join('examples', 'time_cythonfunctions.py'),