diff --git a/sky/shell/tracing_controller.cc b/sky/shell/tracing_controller.cc
index 02e9da2029f1f1cfb6dd3bc19d46cba2cdaeaef1..923e7bdcab7d2b2505b922edab685c736e76522e 100644
--- a/sky/shell/tracing_controller.cc
+++ b/sky/shell/tracing_controller.cc
@@ -21,8 +21,8 @@ namespace shell {
 const char kBaseTraceStart[] = "{\"traceEvents\":[";
 const char kBaseTraceEnd[] = "]}";
 
-const char kObservatoryMethodStartTracing[] = "flutter_startTracing";
-const char kObservatoryMethodStopTracing[] = "flutter_stopTracing";
+const char kObservatoryMethodStartTracing[] = "ext.flutter_startTracing";
+const char kObservatoryMethodStopTracing[] = "ext.flutter_stopTracing";
 const char kObservatoryResultOk[] = "{\"success\" : true}";
 const char kObservatoryResultFail[] = "{\"success\" : false}";