diff --git a/src/core/lib/channel/promise_based_filter.h b/src/core/lib/channel/promise_based_filter.h
index 75cefbc5a66..261f6ebb917 100644
--- a/src/core/lib/channel/promise_based_filter.h
+++ b/src/core/lib/channel/promise_based_filter.h
@@ -232,7 +232,7 @@ struct RaceAsyncCompletion<true> {
 
 template <typename Derived>
 struct FilterCallData {
-  FilterCallData(Derived* channel) : channel(channel) {}
+  explicit FilterCallData(Derived* channel) : channel(channel) {}
   GPR_NO_UNIQUE_ADDRESS typename Derived::Call call;
   GPR_NO_UNIQUE_ADDRESS
   typename TypeIfNeeded<Latch<ServerMetadataHandle>,
@@ -296,11 +296,11 @@ inline auto RunCall(
 }
 
 template <typename Derived>
-inline auto RunCall(
-    ServerMetadataHandle (Derived::Call::*fn)(ClientMetadata& md,
-                                              Derived* channel),
-    CallArgs call_args, NextPromiseFactory next_promise_factory,
-    FilterCallData<Derived>* call_data) -> ArenaPromise<ServerMetadataHandle> {
+inline auto RunCall(ServerMetadataHandle (Derived::Call::*fn)(
+                        ClientMetadata& md, Derived* channel),
+                    CallArgs call_args, NextPromiseFactory next_promise_factory,
+                    FilterCallData<Derived>* call_data)
+    -> ArenaPromise<ServerMetadataHandle> {
   GPR_DEBUG_ASSERT(fn == &Derived::Call::OnClientInitialMetadata);
   auto return_md = call_data->call.OnClientInitialMetadata(
       *call_args.client_initial_metadata, call_data->channel);