diff --git a/stepmania/src/Actor.cpp b/stepmania/src/Actor.cpp
index c64bc6b149..6306bd8528 100644
--- a/stepmania/src/Actor.cpp
+++ b/stepmania/src/Actor.cpp
@@ -297,7 +297,7 @@ void Actor::UpdateTweening( float fDeltaTime )
 	}
 }
 
-bool Actor::IsFirstUpdate()
+bool Actor::IsFirstUpdate() const
 {
 	return m_bFirstUpdate;
 }
diff --git a/stepmania/src/Actor.h b/stepmania/src/Actor.h
index 7366b18f16..4055e693e9 100644
--- a/stepmania/src/Actor.h
+++ b/stepmania/src/Actor.h
@@ -64,7 +64,7 @@ public:
 	virtual void DrawPrimitives() {};	// Derivitives should override
 	virtual void EndDraw();				// pops transform from world matrix stack
 	
-	bool IsFirstUpdate();
+	bool IsFirstUpdate() const;
 	virtual void Update( float fDeltaTime );
 	void UpdateTweening( float fDeltaTime );
 	void CopyTweening( const Actor &from );