diff --git a/src/syscall/zx/fidl/interface.go b/src/syscall/zx/fidl/interface.go
index 359cf8a..239293e 100644
--- a/src/syscall/zx/fidl/interface.go
+++ b/src/syscall/zx/fidl/interface.go
@@ -46,7 +46,7 @@
 	Send(ordinal uint64, req Message) error
 	// TODO(FIDL-524): Remove `gen_ordinal` post-ordinal migration.
 	Recv(ordinal uint64, resp Message, gen_ordinal ...uint64) error
-	Call(ordinal uint64, req Message, resp Message) error
+	Call(ordinal uint64, req Message, resp Message, gen_ordinal ...uint64) error
 }
 
 // Stub represents a generated type which wraps the server-side implementation of a
@@ -167,7 +167,7 @@
 // Call sends the request over the channel with the specified ordinal
 // and synchronously waits for a response. It then writes the response into the
 // response.
-func (p *ChannelProxy) Call(ordinal uint64, req Message, resp Message) error {
+func (p *ChannelProxy) Call(ordinal uint64, req Message, resp Message, gen_ordinal ...uint64) error {
 	respb := messageBytesPool.Get().([]byte)
 	resph := messageHandlesPool.Get().([]zx.Handle)
 
@@ -189,5 +189,5 @@
 		return err
 	}
 
-	return unmarshalForOrdinal(ordinal, respb[:cnb], resph[:cnh], resp)
+	return unmarshalForOrdinal(ordinal, respb[:cnb], resph[:cnh], resp, gen_ordinal...)
 }