diff --git a/handlers/dup.in b/handlers/dup.in
index 3ffe9311d02b1e77527ae2f3df1b1c719f0e6bb5..3c586c6aa92ba3b1f71905ec823af52123989538 100644
--- a/handlers/dup.in
+++ b/handlers/dup.in
@@ -104,7 +104,7 @@ fi
 ### COMMAND-LINE MANGLING ######################################################
 
 ### initialize $execstr*
-execstr_precmd=
+execstr_precmd='LC_ALL=C'
 execstr_command=
 execstr_options="$options --no-print-statistics"
 execstr_source=