diff --git a/src/Script.cpp b/src/Script.cpp
index 7c0dfd3..da36b56 100644
--- a/src/Script.cpp
+++ b/src/Script.cpp
@@ -36,6 +36,10 @@ namespace d2
     scm_c_define_gsubr("mouse-y", 0, 0, 0,
                        reinterpret_cast<void*>(&fn_mouse_y));
 
+    // Filesystem
+    // ----------
+    scm_c_define_gsubr("rootdir", 0, 0, 1,
+                       reinterpret_cast<void*>(&fn_rootdir));
 
   }
 
@@ -181,4 +185,21 @@ namespace d2
   {
     return scm_from_int32(Script::game->mouse_y());
   }
+
+  /*static*/ SCM Script::fn_rootdir(SCM scm_args)
+  {
+    std::filesystem::path path =
+      std::filesystem::current_path();
+
+    size_t sz = scm_to_int32(scm_length(scm_args));
+
+    for (size_t i=0; i<sz; i++)
+      {
+        SCM scm_value = scm_list_ref(scm_args, scm_from_uint64(i));
+        auto value = scm_to_locale_string(scm_value);
+        path = path / value;
+      }
+
+    return scm_from_locale_string(path.string().c_str());
+  }
 }
diff --git a/src/Script.hpp b/src/Script.hpp
index 2f0f4ef..9d0fa8c 100644
--- a/src/Script.hpp
+++ b/src/Script.hpp
@@ -29,6 +29,8 @@ namespace d2
     static SCM fn_mouse_x();
     static SCM fn_mouse_y();
 
+    static SCM fn_rootdir(SCM scm_args);
+
   private:
     static std::unique_ptr<Game> game;
     static glm::vec4 color;