diff --git a/src/plugin/DiskResourceProvider.php b/src/plugin/DiskResourceProvider.php
index 3ef8e6d66..33d62b18c 100644
--- a/src/plugin/DiskResourceProvider.php
+++ b/src/plugin/DiskResourceProvider.php
@@ -53,7 +53,7 @@ class DiskResourceProvider implements ResourceProvider{
 	 * @return null|resource Resource data, or null
 	 */
 	public function getResource(string $filename){
-		$filename = rtrim(str_replace("\\", "/", $filename), "/");
+		$filename = rtrim(str_replace(DIRECTORY_SEPARATOR, "/", $filename), "/");
 		if(file_exists($this->file . $filename)){
 			$resource = fopen($this->file . $filename, "rb");
 			if($resource === false) throw new AssumptionFailedError("fopen() should not fail on a file which exists");
diff --git a/src/plugin/PluginBase.php b/src/plugin/PluginBase.php
index 8f5c0d3b8..56febce91 100644
--- a/src/plugin/PluginBase.php
+++ b/src/plugin/PluginBase.php
@@ -83,9 +83,9 @@ abstract class PluginBase implements Plugin, CommandExecutor{
 		$this->loader = $loader;
 		$this->server = $server;
 		$this->description = $description;
-		$this->dataFolder = rtrim($dataFolder, "\\/") . "/";
+		$this->dataFolder = rtrim($dataFolder, "/" . DIRECTORY_SEPARATOR) . "/";
 		//TODO: this is accessed externally via reflection, not unused
-		$this->file = rtrim($file, "\\/") . "/";
+		$this->file = rtrim($file, "/" . DIRECTORY_SEPARATOR) . "/";
 		$this->configFile = $this->dataFolder . "config.yml";
 
 		$prefix = $this->getDescription()->getPrefix();
diff --git a/src/utils/Filesystem.php b/src/utils/Filesystem.php
index ab60becaa..7709deb5f 100644
--- a/src/utils/Filesystem.php
+++ b/src/utils/Filesystem.php
@@ -42,6 +42,7 @@ use function str_replace;
 use function stream_get_contents;
 use function strpos;
 use function unlink;
+use const DIRECTORY_SEPARATOR;
 use const LOCK_EX;
 use const LOCK_NB;
 use const LOCK_SH;
@@ -80,7 +81,7 @@ final class Filesystem{
 	 * @return string
 	 */
 	public static function cleanPath($path){
-		$result = str_replace(["\\", ".php", "phar://"], ["/", "", ""], $path);
+		$result = str_replace([DIRECTORY_SEPARATOR, ".php", "phar://"], ["/", "", ""], $path);
 
 		//remove relative paths
 		//TODO: make these paths dynamic so they can be unit-tested against
@@ -89,7 +90,7 @@ final class Filesystem{
 			\pocketmine\PATH => ""
 		];
 		foreach($cleanPaths as $cleanPath => $replacement){
-			$cleanPath = rtrim(str_replace(["\\", "phar://"], ["/", ""], $cleanPath), "/");
+			$cleanPath = rtrim(str_replace([DIRECTORY_SEPARATOR, "phar://"], ["/", ""], $cleanPath), "/");
 			if(strpos($result, $cleanPath) === 0){
 				$result = ltrim(str_replace($cleanPath, $replacement, $result), "/");
 			}
diff --git a/src/utils/Utils.php b/src/utils/Utils.php
index 17d4b495d..7069f85cc 100644
--- a/src/utils/Utils.php
+++ b/src/utils/Utils.php
@@ -72,6 +72,7 @@ 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;