diff --git a/dhtest.c b/dhtest.c
index 69e15ab..c5ebcda 100644
--- a/dhtest.c
+++ b/dhtest.c
@@ -376,11 +376,11 @@ int main(int argc, char *argv[])
 		exit(2);
 	}
 
-	dhinfo_ret = get_dhinfo();
-
 	if (!dhmac_fname_flag)
 		sprintf(dhmac_fname, ETH_F_FMT, ETH_F_ARG(dhmac));
 
+	dhinfo_ret = get_dhinfo();
+
 	iface = if_nametoindex(iface_name);
 	if(iface == 0) {
 		fprintf(stderr, "Interface %s does not exist\n", iface_name);