diff --git a/ChangeLog.d/tls13-middlebox-compat-disabled.txt b/ChangeLog.d/tls13-middlebox-compat-disabled.txt
new file mode 100644
index 0000000..f5331bc
--- /dev/null
+++ b/ChangeLog.d/tls13-middlebox-compat-disabled.txt
@@ -0,0 +1,4 @@
+Bugfix
+   * When MBEDTLS_SSL_TLS1_3_COMPATIBILITY_MODE is disabled, work with
+     peers that have middlebox compatibility enabled, as long as no
+     problematic middlebox is in the way. Fixes #9551.