diff --git a/ble/sm.c b/ble/sm.c
index 9db5e0de9..deb8aacf4 100644
--- a/ble/sm.c
+++ b/ble/sm.c
@@ -211,7 +211,7 @@ static uint8_t sm_accepted_stk_generation_methods;
 static uint8_t sm_max_encryption_key_size;
 static uint8_t sm_min_encryption_key_size;
 static uint8_t sm_auth_req = 0;
-static uint8_t sm_io_capabilities = IO_CAPABILITY_UNKNOWN;
+static uint8_t sm_io_capabilities = IO_CAPABILITY_NO_INPUT_NO_OUTPUT;
 static uint8_t sm_slave_request_security;
 static uint8_t sm_authenticate_outgoing_connections = 0;    // might go away
 
diff --git a/ble/sm.h b/ble/sm.h
index 425295732..55eec64b7 100644
--- a/ble/sm.h
+++ b/ble/sm.h
@@ -68,7 +68,6 @@ typedef enum {
     IO_CAPABILITY_KEYBOARD_ONLY,
     IO_CAPABILITY_NO_INPUT_NO_OUTPUT,
     IO_CAPABILITY_KEYBOARD_DISPLAY, // not used by secure simple pairing
-    IO_CAPABILITY_UNKNOWN = 0xff
 } io_capability_t;
 
 // Authorization state