diff --git a/src/core/lib/promise/map.h b/src/core/lib/promise/map.h
index 2a1979ebb739f..552d3c0d38dff 100644
--- a/src/core/lib/promise/map.h
+++ b/src/core/lib/promise/map.h
@@ -142,7 +142,8 @@ template <typename Promise, typename Fn0, typename Fn1>
 class Map<Map<Promise, Fn0>, Fn1> {
   using InnerMapFn = decltype(std::declval<Map<Promise, Fn0>>().fn_);
   using FusedFn =
-      promise_detail::FusedFns<typename Map<Promise, Fn0>::PromiseResult, InnerMapFn, Fn1>;
+      promise_detail::FusedFns<typename Map<Promise, Fn0>::PromiseResult,
+                               InnerMapFn, Fn1>;
   using PromiseType = typename Map<Promise, Fn0>::PromiseType;
 
  public: