diff --git a/html/includes/authentication/ad-authorization.inc.php b/html/includes/authentication/ad-authorization.inc.php
index 750c3f62dd..010a3e2b6c 100644
--- a/html/includes/authentication/ad-authorization.inc.php
+++ b/html/includes/authentication/ad-authorization.inc.php
@@ -11,27 +11,27 @@ if (isset($config['auth_ad_check_certificates']) &&
 };
 
 // Set up connection to LDAP server
-$ds = @ldap_connect($config['auth_ad_url']);
-if (! $ds) {
-    echo '<h2>Fatal error while connecting to AD url ' . $config['auth_ad_url'] . ': ' . ldap_error($ds) . '</h2>';
+$ldap_connection = @ldap_connect($config['auth_ad_url']);
+if (! $ldap_connection) {
+    echo '<h2>Fatal error while connecting to AD url ' . $config['auth_ad_url'] . ': ' . ldap_error($ldap_connection) . '</h2>';
     exit;
 }
 
 // disable referrals and force ldap version to 3
-ldap_set_option($ds, LDAP_OPT_REFERRALS, 0);
-ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION, 3);
+ldap_set_option($ldap_connection, LDAP_OPT_REFERRALS, 0);
+ldap_set_option($ldap_connection, LDAP_OPT_PROTOCOL_VERSION, 3);
 
 // Bind to AD
 if (isset($config['auth_ad_binduser']) && isset($config['auth_ad_bindpassword'])) {
     // With specified bind user
-    if (! ldap_bind($ds, "${config['auth_ad_binduser']}@${config['auth_ad_domain']}", "${config['auth_ad_bindpassword']}")) {
-        echo ldap_error($ds);
+    if (! ldap_bind($ldap_connection, "${config['auth_ad_binduser']}@${config['auth_ad_domain']}", "${config['auth_ad_bindpassword']}")) {
+        echo ldap_error($ldap_connection);
     }
 }
 else {
     // Anonymous
-    if (! ldap_bind($ds)) {
-        echo ldap_error($ds);
+    if (! ldap_bind($ldap_connection)) {
+        echo ldap_error($ldap_connection);
     }
 }
 
diff --git a/html/includes/authentication/ldap-authorization.inc.php b/html/includes/authentication/ldap-authorization.inc.php
index afda92e299..6c0145c4ff 100644
--- a/html/includes/authentication/ldap-authorization.inc.php
+++ b/html/includes/authentication/ldap-authorization.inc.php
@@ -45,19 +45,19 @@ if (! isset ($_SESSION['username'])) {
 /**
  * Set up connection to LDAP server
  */
-$ds = @ldap_connect ($config['auth_ldap_server'], $config['auth_ldap_port']);
-if (! $ds) {
-    echo '<h2>Fatal error while connecting to LDAP server ' . $config['auth_ldap_server'] . ':' . $config['auth_ldap_port'] . ': ' . ldap_error($ds) . '</h2>';
+$ldap_connection = @ldap_connect ($config['auth_ldap_server'], $config['auth_ldap_port']);
+if (! $ldap_connection) {
+    echo '<h2>Fatal error while connecting to LDAP server ' . $config['auth_ldap_server'] . ':' . $config['auth_ldap_port'] . ': ' . ldap_error($ldap_connection) . '</h2>';
     exit;
 }
 if ($config['auth_ldap_version']) {
-    ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION, $config['auth_ldap_version']);
+    ldap_set_option($ldap_connection, LDAP_OPT_PROTOCOL_VERSION, $config['auth_ldap_version']);
 }
 
 if ($config['auth_ldap_starttls'] && ($config['auth_ldap_starttls'] == 'optional' || $config['auth_ldap_starttls'] == 'require')) {
-    $tls = ldap_start_tls($ds);
+    $tls = ldap_start_tls($ldap_connection);
     if ($config['auth_ldap_starttls'] == 'require' && $tls === false) {
-        echo '<h2>Fatal error: LDAP TLS required but not successfully negotiated:' . ldap_error($ds) . '</h2>';
+        echo '<h2>Fatal error: LDAP TLS required but not successfully negotiated:' . ldap_error($ldap_connection) . '</h2>';
         exit;
     }
 }
diff --git a/html/includes/authentication/ldap.inc.php b/html/includes/authentication/ldap.inc.php
index 4948b63796..884ce7db14 100644
--- a/html/includes/authentication/ldap.inc.php
+++ b/html/includes/authentication/ldap.inc.php
@@ -1,11 +1,11 @@
 <?php
 
-$ds = @ldap_connect($config['auth_ldap_server'], $config['auth_ldap_port']);
+$ldap_connection = @ldap_connect($config['auth_ldap_server'], $config['auth_ldap_port']);
 
 if ($config['auth_ldap_starttls'] && ($config['auth_ldap_starttls'] == 'optional' || $config['auth_ldap_starttls'] == 'require')) {
-    $tls = ldap_start_tls($ds);
+    $tls = ldap_start_tls($ldap_connection);
     if ($config['auth_ldap_starttls'] == 'require' && $tls === false) {
-        echo '<h2>Fatal error: LDAP TLS required but not successfully negotiated:'.ldap_error($ds).'</h2>';
+        echo '<h2>Fatal error: LDAP TLS required but not successfully negotiated:'.ldap_error($ldap_connection).'</h2>';
         exit;
     }
 }