diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5f67bc..c896fcd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@ Note: Breaking changes between versions are indicated by "💥".
 
 ## Unreleased
 
+- [Bugfix] Fix "Read-only file system" errors when running `tutor dev runserver` commands on Mac OS. (again, see #392)
 - [Feature] Automatically bind-mount volumes from the `volumes/` directory with the `--volume=/...` syntax.
 
 ## v11.0.7 (2021-01-11)
diff --git a/tutor/templates/build/openedx-dev/bin/docker-entrypoint.sh b/tutor/templates/build/openedx-dev/bin/docker-entrypoint.sh
index 7c393e6..7c10997 100644
--- a/tutor/templates/build/openedx-dev/bin/docker-entrypoint.sh
+++ b/tutor/templates/build/openedx-dev/bin/docker-entrypoint.sh
@@ -7,7 +7,7 @@ if id -u openedx > /dev/null 2>&1; then
     find /openedx \
         -not -path "/openedx/edx-platform/*" \
         -not -user openedx \
-        -perm /u=w \
+        -writable \
         -exec chown openedx:openedx {} \+
     echo "File permissions set."