diff --git a/tests/data/test165 b/tests/data/test165
index 9009425aad..47de3919b3 100644
--- a/tests/data/test165
+++ b/tests/data/test165
@@ -32,7 +32,7 @@ idn
 proxy
 </features>
 <setenv>
-LC_ALL=
+LC_ALL=en_US.UTF-8
 LC_CTYPE=en_US.UTF-8
 </setenv>
 <precheck>