diff --git a/firmware/src_board/iso7816_4.c b/firmware/src_board/iso7816_4.c
index 134683a..dcf86d0 100644
--- a/firmware/src_board/iso7816_4.c
+++ b/firmware/src_board/iso7816_4.c
@@ -655,7 +655,7 @@
                      | US_MR_PAR_EVEN
                      | US_MR_CHRL_8_BIT
                      | US_MR_CLKO
-                     | (3<<24), /* MAX_ITERATION */
+                     | (0<<24), /* MAX_ITERATION */
                      1,
                      0);