Optional parameters are SCM_UNDEFINED

[guile-irrlicht.git] / src / gui.cpp

diff --git a/src/gui.cpp b/src/gui.cpp
index 997d28b08a74140809cec5d68020a34ec2afc8a7..cd8eef34773c48e998138635f6c8eea99cf7399a 100644 (file)
--- a/src/gui.cpp
+++ b/src/gui.cpp
@@ -147,7 +147,7 @@ extern "C" {
         // Params: color and dest_color (optional)
         return irr_gui_IGUIInOutFader_setColor (wrapped_obj, color, dest_color);
       }
-    else if (gui_skin_p (wrapped_obj) && !scm_is_false (dest_color))
+    else if (gui_skin_p (wrapped_obj) && dest_color != SCM_UNDEFINED)
       {
         // Params: which and new_color
         return irr_gui_IGUISkin_setColor (wrapped_obj, color, dest_color);