diff --git a/windows/colordialog.cpp b/windows/colordialog.cpp
index d7030a4f..a04c4461 100644
--- a/windows/colordialog.cpp
+++ b/windows/colordialog.cpp
@@ -314,7 +314,7 @@ static void drawGrid(ID2D1RenderTarget *rt, D2D1_RECT_F *fillRect)
 	pformat = rt->GetPixelFormat();
 #else
 	{
-		typedef D2D1_PIXEL_FORMAT *(__stdcall ID2D1RenderTarget::* GetPixelFormatF)(D2D1_PIXEL_FORMAT *);
+		typedef D2D1_PIXEL_FORMAT *(__stdcall ID2D1RenderTarget::* GetPixelFormatF)(D2D1_PIXEL_FORMAT *) const;
 		GetPixelFormatF gpf;
 
 		gpf = (GetPixelFormatF) (&(rt->GetPixelFormat));
diff --git a/windows/winutil.cpp b/windows/winutil.cpp
index 507c5a3f..67f06068 100644
--- a/windows/winutil.cpp
+++ b/windows/winutil.cpp
@@ -144,7 +144,7 @@ D2D1_SIZE_F realGetSize(ID2D1RenderTarget *rt)
 	return rt->GetSize();
 #else
 	D2D1_SIZE_F size;
-	typedef D2D1_SIZE_F *(__stdcall ID2D1RenderTarget::* GetSizeF)(D2D1_SIZE_F *);
+	typedef D2D1_SIZE_F *(__stdcall ID2D1RenderTarget::* GetSizeF)(D2D1_SIZE_F *) const;
 	GetSizeF gs;
 
 	gs = (GetSizeF) (&(rt->GetSize));