diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index b007316fa..31d91c668 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -609,9 +609,9 @@ class Actor : Thinker native
 	action native void SetCamera(Actor cam, bool revert = false);
 
 	// DECORATE compatible functions
-	native int	CountInv(class<Inventory> itemtype, int ptr_select = AAPTR_DEFAULT);
-	native double GetDistance(bool checkz, int ptr = AAPTR_TARGET);
-	native double GetAngle(int flags, int ptr = AAPTR_TARGET);
+	native clearscope int CountInv(class<Inventory> itemtype, int ptr_select = AAPTR_DEFAULT) const;
+	native double GetDistance(bool checkz, int ptr = AAPTR_TARGET) const;
+	native double GetAngle(int flags, int ptr = AAPTR_TARGET) const;
 	native double GetZAt(double px = 0, double py = 0, double angle = 0, int flags = 0, int pick_pointer = AAPTR_DEFAULT);
 	native clearscope int GetSpawnHealth() const;
 	native double GetCrouchFactor(int ptr = AAPTR_PLAYER1);