diff --git a/ipsec/env.sh b/ipsec/env.sh
index 21e23df..1a32d02 100755
--- a/ipsec/env.sh
+++ b/ipsec/env.sh
@@ -3,11 +3,11 @@
 DEBIANPLATFORM="DEBIAN"
 CENTOSPLATFORM="CENTOS"
 
-if [[ -e /etc/version ]]; then
+if [ -n "$(. /etc/os-release; echo $NAME | grep -i Ubuntu)" -o -n "$(. /etc/os-release; echo $NAME | grep -i Debian)" ]; then
 	PLATFORM=$DEBIANPLATFORM
 fi
 
-if [[ -e /etc/issue ]]; then
+if [ -n "$(. /etc/os-release; echo $NAME | grep -i CentOS)" ]; then
 	PLATFORM=$CENTOSPLATFORM
 fi
 
diff --git a/openvpn/env.sh b/openvpn/env.sh
index 8c70755..6c2c51b 100755
--- a/openvpn/env.sh
+++ b/openvpn/env.sh
@@ -3,11 +3,11 @@
 DEBIANPLATFORM="DEBIAN"
 CENTOSPLATFORM="CENTOS"
 
-if [[ -e /etc/version ]]; then
+if [ -n "$(. /etc/os-release; echo $NAME | grep -i Ubuntu)" -o -n "$(. /etc/os-release; echo $NAME | grep -i Debian)" ]; then
 	PLATFORM=$DEBIANPLATFORM
 fi
 
-if [[ -e /etc/issue ]]; then
+if [ -n "$(. /etc/os-release; echo $NAME | grep -i CentOS)" ]; then
 	PLATFORM=$CENTOSPLATFORM
 fi
 
diff --git a/pptp/env.sh b/pptp/env.sh
index ae0d6c9..f84f147 100755
--- a/pptp/env.sh
+++ b/pptp/env.sh
@@ -3,11 +3,11 @@
 DEBIANPLATFORM="DEBIAN"
 CENTOSPLATFORM="CENTOS"
 
-if [[ -e /etc/version ]]; then
+if [ -n "$(. /etc/os-release; echo $NAME | grep -i Ubuntu)" -o -n "$(. /etc/os-release; echo $NAME | grep -i Debian)" ]; then
 	PLATFORM=$DEBIANPLATFORM
 fi
 
-if [[ -e /etc/issue ]]; then
+if [ -n "$(. /etc/os-release; echo $NAME | grep -i CentOS)" ]; then
 	PLATFORM=$CENTOSPLATFORM
 fi