diff --git a/include/sta/rtos/timer.hpp b/include/sta/rtos/timer.hpp
index 7507c3a..d54cfeb 100644
--- a/include/sta/rtos/timer.hpp
+++ b/include/sta/rtos/timer.hpp
@@ -60,7 +60,7 @@ namespace sta
 		/**
 		 * @returns True of the timmer is currently running.
 		 */
-		bool isRunning();
+		bool isRunning() override;
 
 	private:
 		static void timeoutHandler(void* arg);
diff --git a/src/timer.cpp b/src/timer.cpp
index 79c6361..7c76b24 100644
--- a/src/timer.cpp
+++ b/src/timer.cpp
@@ -62,8 +62,8 @@ namespace sta {
 
     bool RtosTimer::isRunning()
     {
-    	return running_;
-    }
+		return osTimerIsRunning(timer_id_);
+	}
 
     void RtosTimer::timeoutHandler(void* arg)
     {