diff --git a/app/src/control_event.h b/app/src/control_event.h
index a7bde313..ac698065 100644
--- a/app/src/control_event.h
+++ b/app/src/control_event.h
@@ -10,7 +10,7 @@
 
 #define CONTROL_EVENT_QUEUE_SIZE 64
 #define TEXT_MAX_LENGTH 300
-#define SERIALIZED_EVENT_MAX_SIZE 3 + TEXT_MAX_LENGTH
+#define SERIALIZED_EVENT_MAX_SIZE (3 + TEXT_MAX_LENGTH)
 
 enum control_event_type {
     CONTROL_EVENT_TYPE_KEYCODE,