diff --git a/src/librustdoc/clean/inline.rs b/src/librustdoc/clean/inline.rs
index c5e05875819..cb70f465f62 100644
--- a/src/librustdoc/clean/inline.rs
+++ b/src/librustdoc/clean/inline.rs
@@ -335,6 +335,8 @@ fn merge_attrs(
         return;
     }
 
+    let _prof_timer = cx.tcx.sess.prof.generic_activity("build_extern_trait_impl");
+
     let tcx = cx.tcx;
     let associated_trait = tcx.impl_trait_ref(did);
 
diff --git a/src/librustdoc/passes/collect_trait_impls.rs b/src/librustdoc/passes/collect_trait_impls.rs
index 91a0cb413eb..1beb3f2f4ab 100644
--- a/src/librustdoc/passes/collect_trait_impls.rs
+++ b/src/librustdoc/passes/collect_trait_impls.rs
@@ -31,9 +31,7 @@
 
     for &cnum in cx.tcx.crates(()).iter() {
         for &(did, _) in cx.tcx.all_trait_implementations(cnum).iter() {
-            cx.tcx.sess.prof.generic_activity("build_extern_trait_impl").run(|| {
-                inline::build_impl(cx, None, did, None, &mut new_items);
-            });
+            inline::build_impl(cx, None, did, None, &mut new_items);
         }
     }