diff --git a/src/openrct2/drawing/rect.c b/src/openrct2/drawing/Rect.cpp
similarity index 99%
rename from src/openrct2/drawing/rect.c
rename to src/openrct2/drawing/Rect.cpp
index 688707273c..cae3a126f7 100644
--- a/src/openrct2/drawing/rect.c
+++ b/src/openrct2/drawing/Rect.cpp
@@ -19,6 +19,9 @@
 #include "../platform/platform.h"
 #include "drawing.h"
 
+extern "C"
+{
+
 /**
  * Draw a rectangle, with optional border or fill
  *
@@ -114,3 +117,5 @@ void gfx_fill_rect_inset(rct_drawpixelinfo* dpi, sint16 left, sint16 top, sint16
         }
     }
 }
+
+}