diff --git a/wadsrc/static/zscript/actors/actor.zs b/wadsrc/static/zscript/actors/actor.zs
index 89c6a0ed42..8d23ea6881 100644
--- a/wadsrc/static/zscript/actors/actor.zs
+++ b/wadsrc/static/zscript/actors/actor.zs
@@ -1407,8 +1407,8 @@ class Actor : Thinker native
 	native version("4.15.1") double GetNamedBoneLength(Name boneName);
 
 	// this is the direction of the bone in the armature, does not take the current animation or offset into account at all
-	native version("4.15.1") double GetBoneDir(int boneIndex);
-	native version("4.15.1") double GetNamedBoneDir(Name boneName);
+	native version("4.15.1") Vector3 GetBoneDir(int boneIndex);
+	native version("4.15.1") Vector3 GetNamedBoneDir(Name boneName);
 
 	//================================================
 	//