diff --git a/board/drivers/gmlan_alt.h b/board/drivers/gmlan_alt.h
index 266a683e6..53f46c2e0 100644
--- a/board/drivers/gmlan_alt.h
+++ b/board/drivers/gmlan_alt.h
@@ -272,6 +272,7 @@ bool bitbang_gmlan(CANPacket_t *to_bang) {
   gmlan_send_ok = true;
   gmlan_alt_mode = BITBANG;
 
+#ifndef STM32H7
   if (gmlan_sendmax == -1) {
     int len = get_bit_message(pkt_stuffed, to_bang);
     gmlan_fail_count = 0;
@@ -285,5 +286,8 @@ bool bitbang_gmlan(CANPacket_t *to_bang) {
     // 33kbps
     setup_timer();
   }
+#else
+  UNUSED(to_bang);
+#endif
   return gmlan_send_ok;
 }