diff --git a/create-attributable-archive.sh b/create-attributable-archive.sh
index 54fea26..4c9e1a4 100755
--- a/create-attributable-archive.sh
+++ b/create-attributable-archive.sh
@@ -280,7 +280,7 @@ read -r -s attribution_passphrase_check
 printf '\n'
 
 printf 'Auditing attribution passphrase...\n'
-ret==`audit_passphrase "$attribution_passphrase" "$attribution_passphrase_check"`
+ret=`audit_passphrase "$attribution_passphrase" "$attribution_passphrase_check"`
 echo "$ret"
 
 printf 'Unsetting attribution_passphrase_check...\n'