diff --git a/construct/core.py b/construct/core.py
index e5f433a6..4631d543 100644
--- a/construct/core.py
+++ b/construct/core.py
@@ -960,6 +960,8 @@ def _emitbuild(self, code):
         return f"(io.write(obj), obj)[1]"
 
     def _emitfulltype(self, ksy, bitwise):
+        if isinstance(self.length, Path):
+            return dict(size=str(self.length).replace('this[\'', '').replace('\']', ''))
         return dict(size=self.length)