diff --git a/doc/examples/reconst_csd.py b/doc/examples/reconst_csd.py
index 0a6c5b7f59..b473556db7 100644
--- a/doc/examples/reconst_csd.py
+++ b/doc/examples/reconst_csd.py
@@ -154,8 +154,7 @@
                              data=data_small,
                              sphere=sphere,
                              relative_peak_threshold=.5,
-                             min_separation_angle=25,
-                             parallel=True)
+                             min_separation_angle=25)
 
 fvtk.clear(ren)
 
diff --git a/doc/examples/tracking_quick_start.py b/doc/examples/tracking_quick_start.py
index e425c4dd83..86901e4e0e 100644
--- a/doc/examples/tracking_quick_start.py
+++ b/doc/examples/tracking_quick_start.py
@@ -63,7 +63,7 @@
                              mask=mask,
                              relative_peak_threshold=.5,
                              min_separation_angle=25,
-                             parallel=True)
+                             parallel=False)
 
 """
 For the tracking part, we will use the fiber directions from the ``csd_model``