diff --git a/apps/boot/ChangeLog b/apps/boot/ChangeLog
index 5b0fcc583..fa1967d11 100644
--- a/apps/boot/ChangeLog
+++ b/apps/boot/ChangeLog
@@ -75,4 +75,5 @@
 0.64: Automatically create .widcache and .clkinfocache to speed up loads
       Bangle.loadWidgets overwritten with fast version on success
       Refuse to work on firmware  <2v16 and remove old polyfills
-0.65: Only display interpreter errors if log is nonzero
\ No newline at end of file
+0.65: Only display interpreter errors if log is nonzero
+0.66: Ensure __FILE__ is set even after a fresh boot (fix #3857)
\ No newline at end of file
diff --git a/apps/boot/bootloader.js b/apps/boot/bootloader.js
index 6e6466f48..8228ab482 100644
--- a/apps/boot/bootloader.js
+++ b/apps/boot/bootloader.js
@@ -23,7 +23,8 @@ if (!_clkApp) {
     require("Storage").writeJSON("setting.json", s);
   }
 }
+if (s.clock) __FILE__=s.clock;
 delete s;
 if (!_clkApp) _clkApp=`E.showMessage("No Clock Found");setWatch(()=>{Bangle.showLauncher();}, global.BTN2||BTN, {repeat:false,edge:"falling"});`;
 eval(_clkApp);
-delete _clkApp;
+delete _clkApp;
\ No newline at end of file
diff --git a/apps/boot/metadata.json b/apps/boot/metadata.json
index afe576e71..93d699c15 100644
--- a/apps/boot/metadata.json
+++ b/apps/boot/metadata.json
@@ -1,7 +1,7 @@
 {
   "id": "boot",
   "name": "Bootloader",
-  "version": "0.65",
+  "version": "0.66",
   "description": "This is needed by Bangle.js to automatically load the clock, menu, widgets and settings",
   "icon": "bootloader.png",
   "type": "bootloader",