diff --git a/include/btstack/hci_cmds.h b/include/btstack/hci_cmds.h
index cee6138d7..ffcf8bea7 100644
--- a/include/btstack/hci_cmds.h
+++ b/include/btstack/hci_cmds.h
@@ -478,6 +478,7 @@ extern "C" {
 #define RFCOMM_CHANNEL_ALREADY_REGISTERED                  0x71
 #define RFCOMM_NO_OUTGOING_CREDITS                         0x72
 #define RFCOMM_AGGREGATE_FLOW_OFF						   0x73
+#define RFCOMM_DATA_LEN_EXCEEDS_MTU						   0x74
 
 #define SDP_HANDLE_ALREADY_REGISTERED                      0x80
 #define SDP_QUERY_INCOMPLETE                               0x81
diff --git a/src/rfcomm.c b/src/rfcomm.c
index 4f5673331..8b7a0ca84 100644
--- a/src/rfcomm.c
+++ b/src/rfcomm.c
@@ -2008,6 +2008,11 @@ int rfcomm_send_internal(uint16_t rfcomm_cid, uint8_t *data, uint16_t len){
         log_error("rfcomm_send_internal cid 0x%02x doesn't exist!", rfcomm_cid);
         return 1;
     }
+
+    if (len > channel->max_frame_size){
+        log_error("rfcomm_send_internal cid 0x%02x, rfcomm data lenght exceeds MTU!", rfcomm_cid);
+        return RFCOMM_DATA_LEN_EXCEEDS_MTU;
+    }
     
     if (!channel->credits_outgoing){
         log_info("rfcomm_send_internal cid 0x%02x, no rfcomm outgoing credits!", rfcomm_cid);