diff --git a/deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl b/deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl
index 16ec6308932d..d90aa549a333 100644
--- a/deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl
+++ b/deps/rabbitmq_mqtt/src/rabbit_mqtt_packet.erl
@@ -12,6 +12,13 @@
 
 -export([init_state/0, reset_state/0,
          parse/2, serialise/2]).
+
+%% This function is nowhere called externally, but must be exported
+%% to circumvent the bug in https://github.com/erlang/otp/issues/7566
+%% If not exported, this function will return garbage binary data on OTP 26
+%% on Mac OS M1 and M2.
+-export([serialise_len/1]).
+
 -export_type([state/0]).
 
 -opaque state() :: unauthenticated | authenticated | fun().