diff --git a/TweakBrush.cpp b/TweakBrush.cpp
index 5df95a82..98848518 100644
--- a/TweakBrush.cpp
+++ b/TweakBrush.cpp
@@ -172,7 +172,7 @@ void TweakStroke::updateStroke(TweakPickInfo& pickInfo) {
 			refBrush->brushAction(m, pickInfo, nullptr, nPts1, outPositions[m]);
 
 			for (int i = 0; i < nPts1; i++)
-				addPoint(m, refBrush->CachedPointIndex(i), outPositions[m][i]);
+				addPoint(m, refBrush->CachedPointIndex(m, i), outPositions[m][i]);
 		}
 	}
 	else {
diff --git a/TweakBrush.h b/TweakBrush.h
index e1c97f29..9f75fe8c 100644
--- a/TweakBrush.h
+++ b/TweakBrush.h
@@ -182,7 +182,7 @@ class TweakBrush {
 		bLiveNormals = newLiveNormals;
 	}
 
-	virtual int CachedPointIndex(int) {
+	virtual int CachedPointIndex(mesh*, int) {
 		return 0;
 	}
 
@@ -357,7 +357,7 @@ class TB_XForm : public TweakBrush {
 	virtual ~TB_XForm();
 
 	void GetWorkingPlane(Vector3& outPlaneNormal, float& outPlaneDist);
-	int CachedPointIndex(int query) {
+	int CachedPointIndex(mesh*, int query) {
 		return query;
 	}
 	void SetXFormType(int type) {