diff --git a/rfb/TightPalette.h b/rfb/TightPalette.h
index 3f8b7ad..2f6448e 100644
--- a/rfb/TightPalette.h
+++ b/rfb/TightPalette.h
@@ -74,7 +74,7 @@
     // reports zero colors and cannot be used any more without calling
     // reset().
     //
-    int insert(rdr::U32 rgb, int numPixels, int bpp);
+    int insert(rdr::U32 rgb, int numPixels);
 
     //
     // Return number of colors in the palette.