diff --git a/pcbnew/import_gfx/dxf_import_plugin.cpp b/pcbnew/import_gfx/dxf_import_plugin.cpp
index f712b323c6..03c3062b8c 100644
--- a/pcbnew/import_gfx/dxf_import_plugin.cpp
+++ b/pcbnew/import_gfx/dxf_import_plugin.cpp
@@ -1061,7 +1061,7 @@ wxString DXF_IMPORT_PLUGIN::toDxfString( const wxString& aStr )
                 break;
 
                 // diameter:
-#ifdef __WINDOWS_
+#ifdef _WIN32
             // windows, as always, is special.
             case 0x00D8:
 #else