diff --git a/.shellcheckrc b/.shellcheckrc
index e5c572b..faf9529 100644
--- a/.shellcheckrc
+++ b/.shellcheckrc
@@ -4,6 +4,7 @@ enable=avoid-nullary-conditions
 enable=deprecate-which
 enable=quote-safe-variables
 enable=require-variable-braces
+enable=require-double-brackets
 
 # SC2162: `read` without `-r` will mangle backslashes.
 # https://github.com/koalaman/shellcheck/wiki/SC2162