diff --git a/install_httpd-2.4.sh b/install_httpd-2.4.sh
index 3c1048d..7264bb7 100755
--- a/install_httpd-2.4.sh
+++ b/install_httpd-2.4.sh
@@ -93,7 +93,7 @@ _BASE_WEBSPACE_DIR="/var/www"
 ## -
 _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"