diff --git a/examples/docker/echo_app.py b/examples/docker/echo_app.py
index 0acc105580e0..645f14ce4dbc 100644
--- a/examples/docker/echo_app.py
+++ b/examples/docker/echo_app.py
@@ -16,10 +16,10 @@
     setup = 'docker build -t echo:v0 /echo_app'
 
     # The command to run - runs the container and mounts volumes
-    run = 'docker run --rm ' \
-          '--volume="/inputs:/inputs:ro" ' \
-          '--volume="/outputs:/outputs:rw" ' \
-          'echo:v0 /inputs/README.md /outputs/output.txt'
+    run = ('docker run --rm ',
+           '--volume="/inputs:/inputs:ro" ',
+           '--volume="/outputs:/outputs:rw" ',
+           'echo:v0 /inputs/README.md /outputs/output.txt')
 
     echo_app = sky.Task(
         setup=setup,