diff --git a/Fonderie/t.c b/Fonderie/t.c
index 91e051ee..f44824cd 100644
--- a/Fonderie/t.c
+++ b/Fonderie/t.c
@@ -25,7 +25,7 @@ int		convert_to_gray;	/* WTF ? */
 
 /* ----------------------------------------------------------- */
 
-int essai_filterstack(void)
+int essai_filterstack(char *fname)
 {
 int		foo;
 FloatImg	image;
@@ -33,7 +33,7 @@ double		debut, fin;
 
 filterstack_list(__func__);
 
-foo = fimg_create_from_dump("mire.fimg", &image);
+foo = fimg_create_from_dump(fname, &image);
 if (foo) {
 	fprintf(stderr, "err %d create image\n", foo);
 	exit(1);
@@ -98,7 +98,7 @@ if (foo) {
 	exit(1);
 	}
 
-foo = essai_filterstack();
+foo = essai_filterstack("mire.fimg");
 if (foo) {
 	fprintf(stderr, "err %d in essai_filterstack\n", foo);
 	exit(1);