diff --git a/graphics/ttydrv/init.c b/graphics/ttydrv/init.c
index 680419ad209..ce8c0824e42 100644
--- a/graphics/ttydrv/init.c
+++ b/graphics/ttydrv/init.c
@@ -102,7 +102,8 @@ BITMAP_DRIVER TTYDRV_BITMAP_Driver =
 PALETTE_DRIVER TTYDRV_PALETTE_Driver = 
 {
   TTYDRV_PALETTE_SetMapping,
-  TTYDRV_PALETTE_UpdateMapping
+  TTYDRV_PALETTE_UpdateMapping,
+  TTYDRV_PALETTE_IsDark
 };
 
 /* FIXME: Adapt to the TTY driver. Copied from the X11 driver */
diff --git a/graphics/ttydrv/palette.c b/graphics/ttydrv/palette.c
index 55cd2fa6bb6..c8bf91777b3 100644
--- a/graphics/ttydrv/palette.c
+++ b/graphics/ttydrv/palette.c
@@ -39,3 +39,11 @@ int TTYDRV_PALETTE_UpdateMapping(PALETTEOBJ *palPtr)
 {
   return 0;
 }
+
+/***********************************************************************
+ *           TTYDRV_PALETTE_IsDark
+ */
+int TTYDRV_PALETTE_IsDark(int pixel)
+{
+  return 0;
+}
diff --git a/graphics/x11drv/init.c b/graphics/x11drv/init.c
index dace94921ca..ac34bfc49e6 100644
--- a/graphics/x11drv/init.c
+++ b/graphics/x11drv/init.c
@@ -116,7 +116,8 @@ BITMAP_DRIVER X11DRV_BITMAP_Driver =
 PALETTE_DRIVER X11DRV_PALETTE_Driver =
 {
   X11DRV_PALETTE_SetMapping,
-  X11DRV_PALETTE_UpdateMapping
+  X11DRV_PALETTE_UpdateMapping,
+  X11DRV_PALETTE_IsDark
 };
 
 DeviceCaps X11DRV_DevCaps = {