diff --git a/src/gui_photon.c b/src/gui_photon.c
index d4360fe..293debe 100644
--- a/src/gui_photon.c
+++ b/src/gui_photon.c
@@ -2114,6 +2114,11 @@
 }
 
     void
+gui_mch_set_sp_color(guicolor_T color)
+{
+}
+
+    void
 gui_mch_invert_rectangle(int row, int col, int nr, int nc)
 {
     PhRect_t rect;