--- a/tools/profiler/public/GeckoProfiler.h
+++ b/tools/profiler/public/GeckoProfiler.h
@@ -241,24 +241,29 @@ static inline void profiler_js_operation
 static inline double profiler_time() { return 0; }
 static inline double profiler_time(const mozilla::TimeStamp& aTime) { return 0; }
 
 static inline bool profiler_in_privacy_mode() { return false; }
 
 static inline void profiler_log(const char *str) {}
 static inline void profiler_log(const char *fmt, va_list args) {}
 
+namespace mozilla {
+
 class AutoProfilerRegister final MOZ_STACK_CLASS
 {
-  AutoProfilerRegister(const char* aName) {}
+public:
+  explicit AutoProfilerRegister(const char* aName) {}
 private:
   AutoProfilerRegister(const AutoProfilerRegister&) = delete;
   AutoProfilerRegister& operator=(const AutoProfilerRegister&) = delete;
 };
 
+} // namespace mozilla
+
 #else
 
 #include "GeckoProfilerImpl.h"
 
 #endif
 
 class MOZ_RAII GeckoProfilerInitRAII {
 public: