diff --git a/install_postfix_advanced.sh b/install_postfix_advanced.sh
index 15148f1..ccaee1e 100755
--- a/install_postfix_advanced.sh
+++ b/install_postfix_advanced.sh
@@ -2621,7 +2621,7 @@ fi
 ## -
 echononl "   Generate DH key length=512 \"/etc/postfix/ssl/dh_512.pem\""
 if [[ ! -f /etc/postfix/ssl/dh_512.pem ]]; then
-   if [[ $DIST_VERSION -gt 11 ]] ; then
+   if [[ "$os_dist" = "debian" ]] && [[ $os_version -gt 11 ]] ; then
       openssl dhparam -out /etc/postfix/ssl/dh_512.pem 512 > /dev/null 2>&1
    else
       openssl dhparam -dsaparam -out /etc/postfix/ssl/dh_512.pem 512 > /dev/null 2>&1
@@ -2632,7 +2632,7 @@ if [[ ! -f /etc/postfix/ssl/dh_512.pem ]]; then
       echo_failed
    fi
 else
-   if [[ $DIST_VERSION -gt 11 ]] ; then
+   if [[ "$os_dist" = "debian" ]] && [[ $os_version -gt 11 ]] ; then
       if $(grep -q -E "X9.42" /etc/postfix/ssl/dh_512.pem 2> /dev/null); then
          openssl dhparam -out /etc/postfix/ssl/dh_512.pem 512 > /dev/null 2>&1
          if [[ $? -eq 0 ]] ; then
@@ -2649,7 +2649,7 @@ else
 fi
 echononl "   Generate DH key length=1024 \"/etc/postfix/ssl/dh_1024.pem\""
 if [[ ! -f /etc/postfix/ssl/dh_1024.pem ]]; then
-   if [[ $DIST_VERSION -gt 11 ]] ; then
+   if [[ "$os_dist" = "debian" ]] && [[ $os_version -gt 11 ]] ; then
       openssl dhparam -out /etc/postfix/ssl/dh_1024.pem 1024 > /dev/null 2>&1
    else
       openssl dhparam -dsaparam -out /etc/postfix/ssl/dh_1024.pem 1024 > /dev/null 2>&1
@@ -2660,7 +2660,7 @@ if [[ ! -f /etc/postfix/ssl/dh_1024.pem ]]; then
       echo_failed
    fi
 else
-   if [[ $DIST_VERSION -gt 11 ]] ; then
+   if [[ "$os_dist" = "debian" ]] && [[ $os_version -gt 11 ]] ; then
       if $(grep -q -E "X9.42" /etc/postfix/ssl/dh_1024.pem 2> /dev/null); then
          openssl dhparam -out /etc/postfix/ssl/dh_1024.pem 1024 > /dev/null 2>&1
          if [[ $? -eq 0 ]] ; then
@@ -2677,7 +2677,7 @@ else
 fi
 echononl "   Generate DH key length=2048 \"/etc/postfix/ssl/dh_2048.pem\""
 if [[ ! -f /etc/postfix/ssl/dh_2048.pem ]]; then
-   if [[ $DIST_VERSION -gt 11 ]] ; then
+   if [[ "$os_dist" = "debian" ]] && [[ $os_version -gt 11 ]] ; then
       openssl dhparam -out /etc/postfix/ssl/dh_2048.pem 2048 > /dev/null 2>&1
    else
       openssl dhparam -dsaparam -out /etc/postfix/ssl/dh_2048.pem 2048 > /dev/null 2>&1
@@ -2688,7 +2688,7 @@ if [[ ! -f /etc/postfix/ssl/dh_2048.pem ]]; then
       echo_failed
    fi
 else
-   if [[ $DIST_VERSION -gt 11 ]] ; then
+   if [[ "$os_dist" = "debian" ]] && [[ $os_version -gt 11 ]] ; then
       if $(grep -q -E "X9.42" /etc/postfix/ssl/dh_2048.pem 2> /dev/null); then
          openssl dhparam -out /etc/postfix/ssl/dh_2048.pem 2048 > /dev/null 2>&1
          if [[ $? -eq 0 ]] ; then