diff --git a/create_sympa_listdomain.sh b/create_sympa_listdomain.sh
index bd98615..1611bca 100755
--- a/create_sympa_listdomain.sh
+++ b/create_sympa_listdomain.sh
@@ -113,7 +113,7 @@ else
    ## -
    _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"
diff --git a/install_sympa.sh b/install_sympa.sh
index 0de1d6a..c2754b0 100755
--- a/install_sympa.sh
+++ b/install_sympa.sh
@@ -192,7 +192,8 @@ else
    ## -
    _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"