diff --git a/funcs/filtrage.c b/funcs/filtrage.c
index 212a870..8bf06ec 100644
--- a/funcs/filtrage.c
+++ b/funcs/filtrage.c
@@ -221,6 +221,10 @@ int fimg_lissage_2x2(FloatImg *img)
 {
 int		foo;
 
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p )\n", __func__, img);
+#endif
+
 foo = fimg_lissage_2x2_a(img);
 if (foo) {
 	fprintf(stderr, "%s: fail %d\n", __func__, foo);
@@ -238,7 +242,9 @@ int fimg_lissage_3x3(FloatImg *img)
 int		foo;
 FloatImg	tmp;
 
+#if DEBUG_LEVEL
 fprintf(stderr, ">>> %s ( %p )\n", __func__, img);
+#endif
 
 static FimgFilter3x3   lowpass = {
                 {