diff --git a/shared-bindings/bleio/CharacteristicBuffer.c b/shared-bindings/bleio/CharacteristicBuffer.c
index 66d164954e1ad..c368de361478d 100644
--- a/shared-bindings/bleio/CharacteristicBuffer.c
+++ b/shared-bindings/bleio/CharacteristicBuffer.c
@@ -144,7 +144,7 @@ STATIC mp_uint_t bleio_characteristic_buffer_ioctl(mp_obj_t self_in, mp_uint_t r
     raise_error_if_deinited(common_hal_bleio_characteristic_buffer_deinited(self));
     raise_error_if_not_connected(self);
     if (!common_hal_bleio_characteristic_buffer_connected(self)) {
-        mp_raise_ValueError(translate("Not connected."));
+        mp_raise_ValueError(translate("Not connected"));
     }
     mp_uint_t ret;
     if (request == MP_IOCTL_POLL) {