diff --git a/source/mijin/virtual_filesystem/filesystem.hpp b/source/mijin/virtual_filesystem/filesystem.hpp
index b7ae653..54d70a3 100644
--- a/source/mijin/virtual_filesystem/filesystem.hpp
+++ b/source/mijin/virtual_filesystem/filesystem.hpp
@@ -11,6 +11,7 @@
 #include <string>
 #include <vector>
 #include "../io/stream.hpp"
+#include "../util/hash.hpp"
 
 namespace fs = std::filesystem;
 
@@ -49,6 +50,8 @@ private:
 public:
     PathReference(class FileSystemAdapter* adapter, fs::path path) noexcept : adapter_(adapter), path_(std::move(path)) {}
 
+    auto operator<=>(const PathReference& other) const noexcept = default;
+
     [[nodiscard]] class FileSystemAdapter* getAdapter() const noexcept { return adapter_; }
     [[nodiscard]] const fs::path& getPath() const noexcept { return path_; }
     [[nodiscard]] inline FileInfo getInfo() const;
@@ -129,4 +132,16 @@ inline std::string formatFileSize(std::size_t sizeInBytes)
 
 } // namespace mijin
 
+template<>
+struct std::hash<mijin::PathReference>
+{
+    std::size_t operator()(const mijin::PathReference& pathRef) const noexcept
+    {
+        std::size_t hash = 0;
+        mijin::hashCombine(hash, pathRef.getAdapter());
+        mijin::hashCombine(hash, pathRef.getPath());
+        return hash;
+    }
+};
+
 #endif // !defined(MIJIN_VIRTUAL_FILESYSTEM_FILESYSTEM_HPP_INCLUDED)