diff --git a/events/EventMessage.cpp b/events/EventMessage.cpp
index bbc41e100..548b4f0f3 100644
--- a/events/EventMessage.cpp
+++ b/events/EventMessage.cpp
@@ -109,6 +109,6 @@ bool EventMessage::isClearedEventMessage() {
 	return getEvent() == INVALID_EVENT;
 }
 
-size_t EventMessage::getMinimumMessageSize() {
+size_t EventMessage::getMinimumMessageSize() const {
 	return EVENT_MESSAGE_SIZE;
 }
diff --git a/events/EventMessage.h b/events/EventMessage.h
index 4d003bd7b..f2f5ffb50 100644
--- a/events/EventMessage.h
+++ b/events/EventMessage.h
@@ -45,7 +45,7 @@ public:
 
 protected:
 	static const Event INVALID_EVENT = 0;
-	virtual size_t getMinimumMessageSize();
+	virtual size_t getMinimumMessageSize() const override;
 
 };