diff --git a/sky/shell/tracing_controller.cc b/sky/shell/tracing_controller.cc
index 9ef90a4bab0..a525ef02e97 100644
--- a/sky/shell/tracing_controller.cc
+++ b/sky/shell/tracing_controller.cc
@@ -18,7 +18,6 @@ namespace shell {
 
 const char kBaseTraceStart[] = "{\"traceEvents\":[";
 const char kBaseTraceEnd[] = "]}";
-const char kSentinel[] = "\0";
 
 TracingController::TracingController()
     : view_(nullptr), picture_tracing_enabled_(false), weak_factory_(this) {