diff --git a/rr-gen-tours b/rr-gen-tours
index 1c37ec5..467608d 100755
--- a/rr-gen-tours
+++ b/rr-gen-tours
@@ -12,6 +12,9 @@ VERSION="0.1"
 
 argv0=${0##*/}
 
+# Fix the notation of decimal point
+export LANG=en_US.UTF-8
+
 function usage {
     cat <<EOF
 Automatic generation of tours.