diff --git a/vpnsetup.sh b/vpnsetup.sh
index 5d84970..82279c1 100755
--- a/vpnsetup.sh
+++ b/vpnsetup.sh
@@ -69,9 +69,9 @@ fi
 if [ -z "$VPN_IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
   echo "VPN credentials not set by user. Generating random PSK and password..."
   echo
-  VPN_IPSEC_PSK="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+  VPN_IPSEC_PSK="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
   VPN_USER=vpnuser
-  VPN_PASSWORD="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+  VPN_PASSWORD="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
 fi
 
 if [ -z "$VPN_IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
diff --git a/vpnsetup_centos.sh b/vpnsetup_centos.sh
index 2757c3f..e2d7882 100755
--- a/vpnsetup_centos.sh
+++ b/vpnsetup_centos.sh
@@ -73,9 +73,9 @@ fi
 if [ -z "$VPN_IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
   echo "VPN credentials not set by user. Generating random PSK and password..."
   echo
-  VPN_IPSEC_PSK="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+  VPN_IPSEC_PSK="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
   VPN_USER=vpnuser
-  VPN_PASSWORD="$(< /dev/urandom tr -dc 'A-HJ-NPR-Za-km-z2-9' | head -c 16)"
+  VPN_PASSWORD="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
 fi
 
 if [ -z "$VPN_IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then