diff --git a/src/network/mcpe/NetworkSession.php b/src/network/mcpe/NetworkSession.php
index d53d1d86f..0ac489802 100644
--- a/src/network/mcpe/NetworkSession.php
+++ b/src/network/mcpe/NetworkSession.php
@@ -103,7 +103,6 @@ use pocketmine\utils\Utils;
 use pocketmine\world\Position;
 use function array_map;
 use function array_values;
-use function assert;
 use function base64_encode;
 use function bin2hex;
 use function count;
diff --git a/src/network/mcpe/handler/InGamePacketHandler.php b/src/network/mcpe/handler/InGamePacketHandler.php
index e5041ab19..0514c6e90 100644
--- a/src/network/mcpe/handler/InGamePacketHandler.php
+++ b/src/network/mcpe/handler/InGamePacketHandler.php
@@ -95,6 +95,7 @@ use function implode;
 use function json_decode;
 use function json_encode;
 use function json_last_error_msg;
+use function max;
 use function microtime;
 use function preg_match;
 use function strlen;
diff --git a/src/utils/RegistryTrait.php b/src/utils/RegistryTrait.php
index 80abf6adc..9be348d68 100644
--- a/src/utils/RegistryTrait.php
+++ b/src/utils/RegistryTrait.php
@@ -27,10 +27,10 @@ use function array_map;
 use function count;
 use function get_class;
 use function implode;
+use function mb_strtoupper;
 use function sprintf;
 use function strlen;
 use function strpos;
-use function mb_strtoupper;
 use function substr;
 
 trait RegistryTrait{
diff --git a/src/utils/Utils.php b/src/utils/Utils.php
index 16f9f16d2..565cb2abb 100644
--- a/src/utils/Utils.php
+++ b/src/utils/Utils.php
@@ -72,7 +72,6 @@ use function substr;
 use function sys_get_temp_dir;
 use function trim;
 use function xdebug_get_function_stack;
-use const DIRECTORY_SEPARATOR;
 use const PHP_EOL;
 use const PHP_INT_MAX;
 use const PHP_INT_SIZE;