diff --git a/floatimg.h b/floatimg.h
index 92539588..a62a443e 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -3,7 +3,7 @@
  *			ugly code from tTh
  */
 
-#define		FIMG_VERSION	114
+#define		FIMG_VERSION	115
 
 /*
  *	in memory descriptor
@@ -140,7 +140,7 @@ int fimg_qsort_rgb_b(FloatImg *psrc, FloatImg *pdst, int notused);
 int fimg_equalize_compute(FloatImg *src, void *vptr, float vmax);
 
 int fimg_mk_gray_from(FloatImg *src, FloatImg*dst, int k);
-int fimg_desaturate(FloatImg *src, FloatImg *dst, int k);
+int fimg_desaturate(FloatImg *src, FloatImg *dst, int notused);
 
 /*	module funcs/geometry.c		*/
 int fimg_halfsize_0(FloatImg *src, FloatImg *dst, int notused);
diff --git a/lib/fimg-2gray.c b/lib/fimg-2gray.c
index 4884b9e6..a9a2ea89 100644
--- a/lib/fimg-2gray.c
+++ b/lib/fimg-2gray.c
@@ -52,7 +52,7 @@ for (foo=0; foo<nbb; foo++) {
 return 0;
 }
 /* --------------------------------------------------------------------- */
-int fimg_desaturate(FloatImg *src, FloatImg *dst, int k)
+int fimg_desaturate(FloatImg *src, FloatImg *dst, int notused)
 {
 int		foo, nbb;