diff --git a/Sources/arm/render/Inc.hx b/Sources/arm/render/Inc.hx
index 9cdbc301..f585f093 100644
--- a/Sources/arm/render/Inc.hx
+++ b/Sources/arm/render/Inc.hx
@@ -180,7 +180,7 @@ class Inc {
 			var in2dView = UIView2D.inst.show && UIView2D.inst.type == View2DLayer &&
 						   mx > UIView2D.inst.wx && mx < UIView2D.inst.wx + UIView2D.inst.ww &&
 						   my > UIView2D.inst.wy && my < UIView2D.inst.wy + UIView2D.inst.wh;
-			if ((mx != lastX || my != lastY) && (inViewport || in2dView)) {
+			if ((mx != lastX || my != lastY || UISidebar.inst.brushLocked) && (inViewport || in2dView)) {
 				Context.rdirty = 2;
 				UISidebar.inst.sub = 0;
 			}