diff --git a/src/emqx_boot.erl b/src/emqx_boot.erl
index 72f27d822..da30d2107 100644
--- a/src/emqx_boot.erl
+++ b/src/emqx_boot.erl
@@ -22,7 +22,7 @@
 
 -spec(is_enabled(all|list(router|broker|listener)) -> boolean()).
 is_enabled(Mod) ->
-    (BootMods = boot_modules() =:= all) orelse lists:member(Mod, BootMods).
+    (BootMods = boot_modules()) =:= all orelse lists:member(Mod, BootMods).
 
 boot_modules() ->
     application:get_env(emqx, boot_modules, ?BOOT_MODULES).