diff --git a/ext/mysqli/tests/mysqli_connect_oo_defaults.phpt b/ext/mysqli/tests/mysqli_connect_oo_defaults.phpt
index 60f58fbf18a..899d353f4a0 100644
--- a/ext/mysqli/tests/mysqli_connect_oo_defaults.phpt
+++ b/ext/mysqli/tests/mysqli_connect_oo_defaults.phpt
@@ -9,7 +9,11 @@ new mysqli()
 
 	$tmp    = NULL;
 	$link   = NULL;
-	ini_set('mysqli.default_socket', 'socket');
+
+	if ($socket != "")
+		/* mysqli.default_socket requires non-empty string */
+		ini_set('mysqli.default_socket', 'socket');
+
 	ini_set('mysqli.default_port', 9999);
 	ini_set('mysqli.default_pw', 'password');
 	ini_set('mysqli.default_user', 'user');
@@ -18,21 +22,23 @@ new mysqli()
 	mysqli_report(MYSQLI_REPORT_OFF);
 	mysqli_report(MYSQLI_REPORT_STRICT);
 
-	ini_set('mysqli.default_socket', $socket);
-	try {
-		$mysqli = mysqli_init();
-		$mysqli->real_connect($host, $user, $passwd, $db, $port);
+	if ($socket != "") {
+		ini_set('mysqli.default_socket', $socket);
+		try {
+			$mysqli = mysqli_init();
+			$mysqli->real_connect($host, $user, $passwd, $db, $port);
 
-		if (!$res = $mysqli->query("SELECT 'mysqli.default_socket' AS testing"))
-			printf("[001] [%d] %s\n", $mysqli->errno, $mysqli->error);
-		var_dump($res->fetch_assoc());
-		$res->free_result();
+			if (!$res = $mysqli->query("SELECT 'mysqli.default_socket' AS testing"))
+				printf("[001] [%d] %s\n", $mysqli->errno, $mysqli->error);
+			var_dump($res->fetch_assoc());
+			$res->free_result();
 
-		$mysqli->close();
+			$mysqli->close();
 
-	} catch (mysqli_sql_exception $e) {
-		printf("%s\n", $e->getMessage());
-		printf("[002] Usage of mysqli.default_socket failed\n");
+		} catch (mysqli_sql_exception $e) {
+			printf("%s\n", $e->getMessage());
+			printf("[002] Usage of mysqli.default_socket failed\n");
+		}
 	}
 
 	ini_set('mysqli.default_port', $port);