diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 13ec231513..7a1bfa4e8e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -44,6 +44,9 @@ Fixed
 * Update importlib-metadata from 3.10.1 to 4.8.3 for py3.6 and to 4.10.1 for py3.8 (security). #6072
   Contributed by @jk464
 
+* For "local-shell-script" runner, on readonly filesystems, don't attempt to run chmod +x on script_action. Fixes #5591
+  Contributed by @jk464
+
 Added
 ~~~~~
 * Move `git clone` to `user_home/.st2packs` #5845
diff --git a/contrib/runners/local_runner/local_runner/base.py b/contrib/runners/local_runner/local_runner/base.py
index 4fda9c1866..436d7dbf6b 100644
--- a/contrib/runners/local_runner/local_runner/base.py
+++ b/contrib/runners/local_runner/local_runner/base.py
@@ -116,7 +116,10 @@ def _run(self, action):
         sanitized_args = action.get_sanitized_full_command_string()
 
         # For consistency with the old Fabric based runner, make sure the file is executable
-        if script_action:
+        # Also check to ensure not Read-only file system
+        if script_action and not bool(
+            os.statvfs(self.entry_point).f_flag & os.ST_RDONLY
+        ):
             script_local_path_abs = self.entry_point
             args = "chmod +x %s ; %s" % (script_local_path_abs, args)
             sanitized_args = "chmod +x %s ; %s" % (