diff --git a/application/palemoon/components/preferences/security.xul b/application/palemoon/components/preferences/security.xul
index 43352b926c..d3d321b16c 100644
--- a/application/palemoon/components/preferences/security.xul
+++ b/application/palemoon/components/preferences/security.xul
@@ -43,8 +43,8 @@
-
+ preference="network.stricttransportsecurity.preloadlist" />