diff --git a/host/src/app.c b/host/src/app.c
index 679c2d24..0302fa23 100644
--- a/host/src/app.c
+++ b/host/src/app.c
@@ -112,7 +112,7 @@ struct app
   bool captureStarted;
 
   enum AppState state;
-  enum LGMPTimerState lgmpTimerState;
+  _Atomic(enum LGMPTimerState) lgmpTimerState;
   LGTimer  * lgmpTimer;
   LGThread * frameThread;
   bool threadsStarted;