diff --git a/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.cpp b/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.cpp
index 5ce11133..9c5426b6 100644
--- a/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.cpp
+++ b/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.cpp
@@ -63,14 +63,14 @@ void CCollisionRenderSettingsDialog::SetupWidgets()
     mpUi->HideAiBlockCheckBox->setHidden( Game < EGame::EchoesDemo || Game == EGame::DKCReturns );
 }
 
-void CCollisionRenderSettingsDialog::OnHideMaskChanged(QString NewMask)
+void CCollisionRenderSettingsDialog::OnHideMaskChanged(const QString& NewMask)
 {
     TString MaskStr = TO_TSTRING(NewMask);
     uint64 Mask = (MaskStr.IsHexString() ? MaskStr.ToInt64(16) : 0);
     mpEditor->Viewport()->CollisionRenderSettings().HideMask = Mask;
 }
 
-void CCollisionRenderSettingsDialog::OnHighlightMaskChanged(QString NewMask)
+void CCollisionRenderSettingsDialog::OnHighlightMaskChanged(const QString& NewMask)
 {
     TString MaskStr = TO_TSTRING(NewMask);
     uint64 Mask = (MaskStr.IsHexString() ? MaskStr.ToInt64(16) : 0);
diff --git a/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.h b/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.h
index 7162001b..6b5eac07 100644
--- a/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.h
+++ b/src/Editor/WorldEditor/CCollisionRenderSettingsDialog.h
@@ -23,8 +23,8 @@ public:
 
 public slots:
     void SetupWidgets();
-    void OnHideMaskChanged(QString NewMask);
-    void OnHighlightMaskChanged(QString NewMask);
+    void OnHideMaskChanged(const QString& NewMask);
+    void OnHighlightMaskChanged(const QString& NewMask);
     void OnWireframeToggled(bool Enable);
     void OnSurfaceTypeToggled(bool Enable);
     void OnStandableTrisToggled(bool Enable);