diff --git a/src/l2cap.c b/src/l2cap.c
index 11c88fff2..e18958749 100644
--- a/src/l2cap.c
+++ b/src/l2cap.c
@@ -158,8 +158,6 @@ static btstack_packet_handler_t l2cap_event_packet_handler;
 
 #ifdef ENABLE_L2CAP_ENHANCED_RETRANSMISSION_MODE
 
-static uint8_t l2cap_ertm_omit_fcs_option;
-
 /*
  * CRC lookup table for generator polynom D^16 + D^15 + D^2 + 1
  */
@@ -729,10 +727,6 @@ static void l2cap_ertm_handle_in_sequence_sdu(l2cap_channel_t * l2cap_channel, l
     }
 }
 
-void l2cap_ertm_dont_send_fcs_option(void){
-    l2cap_ertm_omit_fcs_option = 1;
-}
-
 #endif