diff --git a/prtverify.in b/prtverify.in
index 185cab4..fd9a882 100644
--- a/prtverify.in
+++ b/prtverify.in
@@ -159,6 +159,7 @@ main() {
 
 ### Main
 
+export LC_ALL=C
 shopt -s nullglob
 trap "cleanup" HUP INT QUIT TERM