diff --git a/application/palemoon/components/preferences/security.xul b/application/palemoon/components/preferences/security.xul
index b12946f2a5..bc16252751 100644
--- a/application/palemoon/components/preferences/security.xul
+++ b/application/palemoon/components/preferences/security.xul
@@ -43,8 +43,8 @@
-
+ preference="network.stricttransportsecurity.enabled" />