diff --git a/Runtime/GuiSys/CGuiFrame.cpp b/Runtime/GuiSys/CGuiFrame.cpp
index 1b1dd1329..03dc93daa 100644
--- a/Runtime/GuiSys/CGuiFrame.cpp
+++ b/Runtime/GuiSys/CGuiFrame.cpp
@@ -195,7 +195,7 @@ void CGuiFrame::ProcessUserInput(const CFinalInput& input) const {
   }
 }
 
-bool CGuiFrame::ProcessMouseInput(const CFinalInput& input, const CGuiWidgetDrawParms& parms) const {
+bool CGuiFrame::ProcessMouseInput(const CFinalInput& input, const CGuiWidgetDrawParms& parms) {
   if (const auto& kbm = input.GetKBM()) {
     zeus::CVector2f point(kbm->m_mouseCoord.norm[0] * 2.f - 1.f,
                           kbm->m_mouseCoord.norm[1] * 2.f - 1.f);
diff --git a/Runtime/GuiSys/CGuiFrame.hpp b/Runtime/GuiSys/CGuiFrame.hpp
index a5c49d2b1..059316738 100644
--- a/Runtime/GuiSys/CGuiFrame.hpp
+++ b/Runtime/GuiSys/CGuiFrame.hpp
@@ -47,10 +47,10 @@ private:
   float m_aspectConstraint = -1.f;
   float m_maxAspect = -1.f;
 
-  mutable bool m_inMouseDown = false;
-  mutable bool m_inCancel = false;
-  mutable CGuiWidget* m_mouseDownWidget = nullptr;
-  mutable CGuiWidget* m_lastMouseOverWidget = nullptr;
+  bool m_inMouseDown = false;
+  bool m_inCancel = false;
+  CGuiWidget* m_mouseDownWidget = nullptr;
+  CGuiWidget* m_lastMouseOverWidget = nullptr;
   std::function<void(CGuiWidget*, CGuiWidget*)> m_mouseOverChangeCb;
   std::function<void(CGuiWidget*, bool)> m_mouseDownCb;
   std::function<void(CGuiWidget*, bool)> m_mouseUpCb;
@@ -102,7 +102,7 @@ public:
   void Initialize();
   void LoadWidgetsInGame(CInputStream& in, CSimplePool* sp);
   void ProcessUserInput(const CFinalInput& input) const;
-  bool ProcessMouseInput(const CFinalInput& input, const CGuiWidgetDrawParms& parms) const;
+  bool ProcessMouseInput(const CFinalInput& input, const CGuiWidgetDrawParms& parms);
   void ResetMouseState();
 
   CGuiWidgetIdDB& GetWidgetIdDB() { return x18_idDB; }