diff --git a/components/devtools/actors/tab.rs b/components/devtools/actors/tab.rs
index 6a0dc601763..7d91a274fea 100644
--- a/components/devtools/actors/tab.rs
+++ b/components/devtools/actors/tab.rs
@@ -140,7 +140,8 @@ impl TabDescriptorActor {
 
     pub fn encodable(&self, registry: &ActorRegistry, selected: bool) -> TabDescriptorActorMsg {
         let ctx_actor = registry.find::<BrowsingContextActor>(&self.browsing_context_actor);
-        let browser_id = ctx_actor.active_pipeline.get().index.0.get();
+        let browser_id = ctx_actor.browsing_context_id.index.0.get();
+        let outer_window_id = ctx_actor.active_pipeline.get().index.0.get();
         let browsing_context_id = ctx_actor.browsing_context_id.index.0.get();
         let title = ctx_actor.title.borrow().clone();
         let url = ctx_actor.url.borrow().clone();
@@ -150,7 +151,7 @@ impl TabDescriptorActor {
             browsing_context_id,
             browser_id,
             is_zombie_tab: false,
-            outer_window_id: browser_id,
+            outer_window_id,
             selected,
             title,
             traits: DescriptorTraits {