diff --git a/resources/package-prefs.json b/resources/package-prefs.json
index 55dc8c72e89..e111e65730d 100644
--- a/resources/package-prefs.json
+++ b/resources/package-prefs.json
@@ -23,7 +23,6 @@
   "js.throw_on_debuggee_would_run.enabled": false,
   "js.dump_stack_on_debuggee_would_run.enabled": false,
   "js.werror.enabled": false,
-  "js.strict.enabled": false,
   "js.shared_memory.enabled": true,
   "js.mem.high_water_mark": 128,
   "js.mem.max": -1,
diff --git a/resources/prefs.json b/resources/prefs.json
index c6ffd343a67..64ac5353cdb 100644
--- a/resources/prefs.json
+++ b/resources/prefs.json
@@ -23,7 +23,6 @@
   "js.throw_on_debuggee_would_run.enabled": false,
   "js.dump_stack_on_debuggee_would_run.enabled": false,
   "js.werror.enabled": false,
-  "js.strict.enabled": false,
   "js.shared_memory.enabled": true,
   "js.mem.high_water_mark": 128,
   "js.mem.max": -1,