diff --git a/media/utils/include/mediautils/TimerThread.h b/media/utils/include/mediautils/TimerThread.h
index ffee602..b69e02c 100644
--- a/media/utils/include/mediautils/TimerThread.h
+++ b/media/utils/include/mediautils/TimerThread.h
@@ -125,6 +125,11 @@
         return s;
     }
 
+    /**
+     * Returns callstack of tid as a string.
+     */
+    static std::string tidCallStackString(pid_t tid);
+
   private:
     // To minimize movement of data, we pass around shared_ptrs to Requests.
     // These are allocated and deallocated outside of the lock.