diff --git a/repo2docker/buildpacks/base.py b/repo2docker/buildpacks/base.py
index 3464f6cb..fab420b1 100644
--- a/repo2docker/buildpacks/base.py
+++ b/repo2docker/buildpacks/base.py
@@ -114,7 +114,7 @@ RUN ./{{ s }}
 {% endif -%}
 
 # Specify the default command to run
-CMD jupyter notebook --ip 0.0.0.0
+CMD ["jupyter", "notebook", "--ip", "0.0.0.0"]
 
 """