diff --git a/components/style/stylesheets/document_rule.rs b/components/style/stylesheets/document_rule.rs
index e779863f031..35c6b443fe2 100644
--- a/components/style/stylesheets/document_rule.rs
+++ b/components/style/stylesheets/document_rule.rs
@@ -264,10 +264,6 @@ impl DocumentCondition {
             return true;
         }
 
-        if !pref!("layout.css.moz-document.url-prefix-hack.enabled") {
-            return false;
-        }
-
         // Allow a single url-prefix() for compatibility.
         //
         // See bug 1446470 and dependencies.