diff --git a/toonz/sources/tnztools/modifiers/modifierassistants.cpp b/toonz/sources/tnztools/modifiers/modifierassistants.cpp
index a80b987..597e97d 100644
--- a/toonz/sources/tnztools/modifiers/modifierassistants.cpp
+++ b/toonz/sources/tnztools/modifiers/modifierassistants.cpp
@@ -151,7 +151,7 @@ TModifierAssistants::modifyTrack(
       if (TObjectHandle *objHandle = TTool::getApplication()->getCurrentObject())
         if (!objHandle->isSpline())
           trackToScreen *= TScale(viewer->getDpiScale().x, viewer->getDpiScale().y);
-    trackToScreen *= viewer->get3dViewMatrix().get2d().inv();
+    trackToScreen *= viewer->get3dViewMatrix().get2d();
     TGuidelineP guideline = TGuideline::findBest(modifier->guidelines, track, trackToScreen, fixed);
     if (guideline != modifier->guidelines.front())
       for(int i = 1; i < (int)modifier->guidelines.size(); ++i)