diff --git a/frontends/gtk/bitmap.c b/frontends/gtk/bitmap.c
index e7b859d06..505753341 100644
--- a/frontends/gtk/bitmap.c
+++ b/frontends/gtk/bitmap.c
@@ -283,22 +283,6 @@ static size_t bitmap_get_rowstride(void *vbitmap)
 }
 
 
-/**
- * Find the bytes per pixel of a bitmap
- *
- * \param  vbitmap  a bitmap, as returned by bitmap_create()
- * \return bytes per pixel
- */
-static size_t bitmap_get_bpp(void *vbitmap)
-{
-	struct bitmap *gbitmap = (struct bitmap *)vbitmap;
-	assert(gbitmap);
-
-	return 4;
-}
-
-
-
 /**
  * Free a bitmap.
  *
@@ -535,7 +519,6 @@ static struct gui_bitmap_table bitmap_table = {
 	.get_rowstride = bitmap_get_rowstride,
 	.get_width = nsgtk_bitmap_get_width,
 	.get_height = nsgtk_bitmap_get_height,
-	.get_bpp = bitmap_get_bpp,
 	.save = bitmap_save,
 	.modified = bitmap_modified,
 	.render = bitmap_render,