diff --git a/floatimg.h b/floatimg.h
index 3704e165..53ef1c56 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -124,6 +124,7 @@ int fimg_cos_010(FloatImg *s, FloatImg *d, double maxval);
 int fimg_mix_rgb_gray(FloatImg *img, float mix);
 int     fimg_shift_to_zero(FloatImg *s, FloatImg *d, float coefs[6]);
 
+int fimg_classif_trial(FloatImg *src, FloatImg*dst, int notused);
 
 /*	module funcs/geometry.c		*/
 int fimg_equalize_compute(FloatImg *src, void *vptr, float vmax);