diff --git a/install_postfixadmin.sh b/install_postfixadmin.sh
index 703ee86..6e4b24d 100755
--- a/install_postfixadmin.sh
+++ b/install_postfixadmin.sh
@@ -151,7 +151,7 @@ DOMAIN="${MAIN_DOMAIN}.$TLD"
 
 httpd_binary="`which httpd`"
 if [ -z "$httpd_binary" ]; then
-   httpd_binary="`ps  -C httpd  -f | grep -e \"^root\" | awk '{print$8}'`"
+   httpd_binary="$(ps -axu | grep httpd |  grep -e "^root" | grep -v grep | awk '{print$11}')"
    if [ -z "$httpd_binary" ]; then
       if [ -x "/usr/local/apache2/bin/httpd" ]; then
          httpd_binary="/usr/local/apache2/bin/httpd"