diff --git a/plugins/RenameFile/StashPluginHelper.py b/plugins/RenameFile/StashPluginHelper.py
index 90c8c1b9..3516b4fb 100644
--- a/plugins/RenameFile/StashPluginHelper.py
+++ b/plugins/RenameFile/StashPluginHelper.py
@@ -481,9 +481,12 @@ def executeProcess(self, args, ExecDetach=False):
                 if self.IS_LINUX:
                     args = ["nohup"] + args
                 self.Trace(f"Executing detached process using Popen({args})")
+                # start_new_session puts the child in its own session, so it survives the
+                # parent task process exiting (needed on macOS; harmless on Linux too).
+                pid = subprocess.Popen(args, start_new_session=True).pid
             else:
                 self.Trace(f"Executing process using normal Popen({args})")
-            pid = subprocess.Popen(args).pid # On detach, may need the following for MAC OS subprocess.Popen(args, shell=True, start_new_session=True)
+                pid = subprocess.Popen(args).pid
         self.Trace(f"pid={pid}")
         return pid
     
diff --git a/plugins/RenameFile/renamefile.yml b/plugins/RenameFile/renamefile.yml
index ca3040e0..0dc62c49 100644
--- a/plugins/RenameFile/renamefile.yml
+++ b/plugins/RenameFile/renamefile.yml
@@ -1,6 +1,6 @@
 name: RenameFile
 description: Renames video (scene) file names when the user edits the [Title] field located in the scene [Edit] tab.
-version: 1.0.4
+version: 1.0.5
 url: https://discourse.stashapp.cc/t/renamefile/1334
 ui:
   css:
diff --git a/plugins/RenameFile/version_history/README.md b/plugins/RenameFile/version_history/README.md
index 5f72ff98..d7929765 100644
--- a/plugins/RenameFile/version_history/README.md
+++ b/plugins/RenameFile/version_history/README.md
@@ -21,3 +21,5 @@
 ### 1.0.3
 - Fixed OSError "File name too long" (macOS) caused by the long-filename truncation logic appending the file extension twice and not reserving space for the hash suffix.
 - Rename/move failures now log a single clear error message instead of also dumping a raw Python traceback to the log.
+### 1.0.5
+- Hardened detached process spawn (executeProcess) with start_new_session=True, so a detached child survives the launching task process exiting on macOS.