2 files changed, 3 insertions, 2 deletions
diff --git a/components/style/gecko/selector_parser.rs b/components/style/gecko/selector_parser.rs
index 26921f9a41b..54beb4a4091 100644
--- a/components/style/gecko/selector_parser.rs
+++ b/components/style/gecko/selector_parser.rs
@@ -215,7 +215,8 @@ impl NonTSPseudoClass {
     pub fn is_attr_based(&self) -> bool {
         matches!(*self,
                  NonTSPseudoClass::MozTableBorderNonzero |
-                 NonTSPseudoClass::MozBrowserFrame)
+                 NonTSPseudoClass::MozBrowserFrame |
+                 NonTSPseudoClass::Lang(..))
     }
 }
 
diff --git a/components/style/servo/selector_parser.rs b/components/style/servo/selector_parser.rs
index 0e18761a027..b754a35462d 100644
--- a/components/style/servo/selector_parser.rs
+++ b/components/style/servo/selector_parser.rs
@@ -276,7 +276,7 @@ impl NonTSPseudoClass {
     /// Returns true if the evaluation of the pseudo-class depends on the
     /// element's attributes.
     pub fn is_attr_based(&self) -> bool {
-        false
+        matches!(*self, NonTSPseudoClass::Lang(..))
     }
 }