diff --git a/funcs/filtrage.c b/funcs/filtrage.c
index 47015fe..a8f278f 100644
--- a/funcs/filtrage.c
+++ b/funcs/filtrage.c
@@ -34,7 +34,7 @@ fprintf(stderr, "    mult  %8.3f\n", filtr->mult);
 fprintf(stderr, "  offset  %8.3f\n", filtr->offset);
 
 value = (sum * filtr->mult) + filtr->offset;
-fprintf(stderr, "   value  %8.3f   ???\n", sum);
+fprintf(stderr, "   value  %8.3f   ???\n", value);
 
 return 0;
 }