diff --git a/libxtables/xtables.c b/libxtables/xtables.c
index f14d503..d0e942c 100644
--- a/libxtables/xtables.c
+++ b/libxtables/xtables.c
@@ -825,6 +825,8 @@ int xtables_compatible_revision(const char *name, uint8_t revision, int opt)
 
 static int compatible_match_revision(const char *name, uint8_t revision)
 {
+	printf("compatible_match_revision name=%s revision=%u\n",
+		name, revision);
 	return xt_params->compat_rev(name, revision, afinfo->so_rev_match);
 }