1 files changed, 12 insertions, 1 deletions
diff --git a/components/script/dom/bindings/trace.rs b/components/script/dom/bindings/trace.rs
index 2c86040308e..06ee56e173a 100644
--- a/components/script/dom/bindings/trace.rs
+++ b/components/script/dom/bindings/trace.rs
@@ -126,7 +126,7 @@ use style::media_queries::MediaList;
 use style::properties::PropertyDeclarationBlock;
 use style::selector_parser::{PseudoElement, Snapshot};
 use style::shared_lock::{Locked as StyleLocked, SharedRwLock as StyleSharedRwLock};
-use style::stylesheet_set::DocumentStylesheetSet;
+use style::stylesheet_set::{AuthorStylesheetSet, DocumentStylesheetSet};
 use style::stylesheets::keyframes_rule::Keyframe;
 use style::stylesheets::{CssRules, FontFaceRule, KeyframesRule, MediaRule, Stylesheet};
 use style::stylesheets::{ImportRule, NamespaceRule, StyleRule, SupportsRule, ViewportRule};
@@ -717,6 +717,17 @@ where
     }
 }
 
+unsafe impl<S> JSTraceable for AuthorStylesheetSet<S>
+where
+    S: JSTraceable + ::style::stylesheets::StylesheetInDocument + PartialEq + 'static,
+{
+    unsafe fn trace(&self, tracer: *mut JSTracer) {
+        for s in self.iter() {
+            s.trace(tracer)
+        }
+    }
+}
+
 unsafe impl<Sink> JSTraceable for LossyDecoder<Sink>
 where
     Sink: JSTraceable + TendrilSink<UTF8>,