1 files changed, 1 insertions, 1 deletions
diff --git a/src/lib/event_history.h b/src/lib/event_history.h
index f723591fb..e194f6333 100644
--- a/src/lib/event_history.h
+++ b/src/lib/event_history.h
@@ -27,7 +27,7 @@
 class EventHistory
 {
 public:
-	EventHistory (int size);
+	explicit EventHistory (int size);
 
 	float rate () const;
 	void event ();