diff --git a/funcs/saturation.c b/funcs/saturation.c
index e36ab08c..bb7f007d 100644
--- a/funcs/saturation.c
+++ b/funcs/saturation.c
@@ -48,7 +48,7 @@ int             sz, idx;
 
 sz = s->width * s->height;
 
-if (FIMG_TYPE_RGB != img->type) {
+if (FIMG_TYPE_RGB != s->type) {
 	fprintf(stderr, "%s bad type\n", __func__);
 	return -6;
 	}