diff --git a/git-blame-ignore-revs b/git-blame-ignore-revs
index 95898c56b..d76cf9165 100644
--- a/git-blame-ignore-revs
+++ b/git-blame-ignore-revs
@@ -23,3 +23,5 @@ acb3544d4b112121b5d9414237d2af7860ccc2a3
 f1acfece6b79ed69b491da03783a7adaa7627b96
 # reformat apps/emqx_management
 aa7807baebfa5d8678025e43f386bcd9b3259d6a
+# reformat apps/emqx_slow_subs
+83511f8a4c1570a2c89d9c6c5b6f462520199ed8
diff --git a/scripts/check-format.sh b/scripts/check-format.sh
index 9063d6fe0..9b5ada731 100755
--- a/scripts/check-format.sh
+++ b/scripts/check-format.sh
@@ -12,7 +12,7 @@ APPS+=( 'apps/emqx' 'apps/emqx_modules' 'apps/emqx_gateway')
 APPS+=( 'apps/emqx_authn' 'apps/emqx_authz' )
 APPS+=( 'lib-ee/emqx_enterprise_conf' 'lib-ee/emqx_license' )
 APPS+=( 'apps/emqx_exhook')
-APPS+=( 'apps/emqx_retainer')
+APPS+=( 'apps/emqx_retainer' 'apps/emqx_slow_subs')
 
 for app in "${APPS[@]}"; do
     echo "$app ..."