diff --git a/include/c1p.h b/include/c1p.h
index cea31b0f3..5789d7156 100644
--- a/include/c1p.h
+++ b/include/c1p.h
@@ -36,6 +36,12 @@
 #  error "This module may only be used when compiling for the Challenger 1P!"
 #endif
 
-/* empty for now */
+/* The following #defines will cause the matching functions calls in conio.h
+** to be overlaid by macros with the same names, saving the function call
+** overhead.
+*/
+#define _textcolor(color)       COLOR_WHITE
+#define _bgcolor(color)         COLOR_BLACK
+#define _bordercolor(color)     COLOR_BLACK
 
 #endif