diff --git a/CMakeLists.txt b/CMakeLists.txt
index b0c61f7c..31f63f07 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -61,6 +61,7 @@ ENDIF( NOT VERSION )
 # Fill in SDLMAIN_LIBRARY on OS X manually to avoid using SDLMain.m
 # OS X users will have to compile and install SDL from source.
 if( APPLE AND ENABLE_SDL )
+    ADD_DEFINITIONS (-DwxMAC_USE_CORE_GRAPHICS )
     SET(SDLMAIN_LIBRARY "-lSDLmain")
 endif( APPLE AND ENABLE_SDL )
 
diff --git a/src/wx/panel.cpp b/src/wx/panel.cpp
index 4587874a..607bfb32 100644
--- a/src/wx/panel.cpp
+++ b/src/wx/panel.cpp
@@ -2324,8 +2324,8 @@ void CairoDrawingPanel::DrawArea(wxWindowDC &dc)
 	cr = cairo_reference((cairo_t*)gc->GetNativeContext());
 #else
 #if defined(__WXMAC__) && wxMAC_USE_CORE_GRAPHICS
-	CGContextRef* c = gc->GetNativeContext();
-	cairo_surface_t* s = cairo_quartz_surface_create_for_cg_context(c);
+	CGContextRef c = static_cast<CGContextRef>(gc->GetNativeContext());
+	cairo_surface_t* s = cairo_quartz_surface_create_for_cg_context(c, width, height);
 	cr = cairo_create(s);
 	cairo_surface_destroy(s);
 #else