1 files changed, 1 insertions, 0 deletions
diff --git a/t/op/groups.t b/t/op/groups.t
index dc8385b853..5778795a0e 100755
--- a/t/op/groups.t
+++ b/t/op/groups.t
@@ -3,6 +3,7 @@
 $ENV{PATH} ="/bin:/usr/bin:/usr/xpg4/bin:/usr/ucb" .
     exists $ENV{PATH} ? ":$ENV{PATH}" : "";
 $ENV{LC_ALL} = "C"; # so that external utilities speak English
+$ENV{LANGUAGE} = 'C'; # GNU locale extension
 
 sub quit {
     print "1..0\n";