diff --git a/adminer/drivers/mongo.inc.php b/adminer/drivers/mongo.inc.php
index 88f22cea..0b10c6e3 100644
--- a/adminer/drivers/mongo.inc.php
+++ b/adminer/drivers/mongo.inc.php
@@ -310,7 +310,7 @@ if (isset($_GET["mongo"])) {
 							$val = (float) $val;
 							$op = $match[1];
 						} elseif (preg_match('~^\(date\)(.+)~', $op, $match)) {
-							$dateTime = new DateTime($val);
+							$dateTime = new \DateTime($val);
 							$val = new \MongoDB\BSON\UTCDatetime($dateTime->getTimestamp() * 1000);
 							$op = $match[1];
 						}
diff --git a/adminer/drivers/mssql.inc.php b/adminer/drivers/mssql.inc.php
index e369f1f9..6c828020 100644
--- a/adminer/drivers/mssql.inc.php
+++ b/adminer/drivers/mssql.inc.php
@@ -136,7 +136,7 @@ if (isset($_GET["mssql"])) {
 					$this->_fields = sqlsrv_field_metadata($this->_result);
 				}
 				$field = $this->_fields[$this->_offset++];
-				$return = new stdClass;
+				$return = new \stdClass;
 				$return->name = $field["Name"];
 				$return->orgname = $field["Name"];
 				$return->type = ($field["Type"] == 1 ? 254 : 0);
diff --git a/adminer/drivers/oracle.inc.php b/adminer/drivers/oracle.inc.php
index f2e97f33..2db3d485 100644
--- a/adminer/drivers/oracle.inc.php
+++ b/adminer/drivers/oracle.inc.php
@@ -107,7 +107,7 @@ if (isset($_GET["oracle"])) {
 
 			function fetch_field() {
 				$column = $this->_offset++;
-				$return = new stdClass;
+				$return = new \stdClass;
 				$return->name = oci_field_name($this->_result, $column);
 				$return->orgname = $return->name;
 				$return->type = oci_field_type($this->_result, $column);
diff --git a/adminer/drivers/pgsql.inc.php b/adminer/drivers/pgsql.inc.php
index 3f7540fe..71e102a0 100644
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -132,7 +132,7 @@ if (isset($_GET["pgsql"])) {
 
 			function fetch_field() {
 				$column = $this->_offset++;
-				$return = new stdClass;
+				$return = new \stdClass;
 				if (function_exists('pg_field_table')) {
 					$return->orgtable = pg_field_table($this->_result, $column);
 				}
diff --git a/plugins/drivers/clickhouse.php b/plugins/drivers/clickhouse.php
index e80bf0c9..a06fb006 100644
--- a/plugins/drivers/clickhouse.php
+++ b/plugins/drivers/clickhouse.php
@@ -119,7 +119,7 @@ if (isset($_GET["clickhouse"])) {
 
 		function fetch_field() {
 			$column = $this->_offset++;
-			$return = new stdClass;
+			$return = new \stdClass;
 			if ($column < count($this->columns)) {
 				$return->name = $this->meta[$column]['name'];
 				$return->orgname = $return->name;