diff --git a/tox.ini b/tox.ini
index 30062d24d19f658f78ad9e226a3ed65c8a52f8ae..f155a0b3cf79004e7f52b531d792792a55b1e687 100644
--- a/tox.ini
+++ b/tox.ini
@@ -150,11 +150,11 @@ conda_channels :
 ; run tests from subfolder to ensure that resources are accessed via resources and not via relative paths
 changedir = {envtmpdir}/6f59bc68108c3895b1828abdd04b9a06
 commands =
-    jupyter nbextension install --py --sys-prefix widgetsnbextension
-    jupyter nbextension enable --py --sys-prefix widgetsnbextension
-    jupyter nbextension install --py --sys-prefix jpy_canvas
-    jupyter nbextension enable --py --sys-prefix jpy_canvas
-    python notebooks/run_all_notebooks.py
+    python -m jupyter nbextension install --py --sys-prefix widgetsnbextension
+    python -m jupyter nbextension enable --py --sys-prefix widgetsnbextension
+    python -m jupyter nbextension install --py --sys-prefix jpy_canvas
+    python -m jupyter nbextension enable --py --sys-prefix jpy_canvas
+    python {toxinidir}/notebooks/run_all_notebooks.py
 
 [testenv:start_jupyter]
 basepython = python
@@ -179,11 +179,11 @@ conda_channels :
     anaconda
 changedir = {toxinidir}
 commands =
-    jupyter nbextension install --py --sys-prefix widgetsnbextension
-    jupyter nbextension enable --py --sys-prefix widgetsnbextension
-    jupyter nbextension install --py --sys-prefix jpy_canvas
-    jupyter nbextension enable --py --sys-prefix jpy_canvas
-    jupyter notebook
+    python -m jupyter nbextension install --py --sys-prefix widgetsnbextension
+    python -m jupyter nbextension enable --py --sys-prefix widgetsnbextension
+    python -m jupyter nbextension install --py --sys-prefix jpy_canvas
+    python -m jupyter nbextension enable --py --sys-prefix jpy_canvas
+    python -m jupyter notebook
 
 [testenv]
 whitelist_externals = pip