diff --git a/PyTeX/build/paths/relative_path.py b/PyTeX/build/paths/relative_path.py
index 14f7ba2..c582818 100644
--- a/PyTeX/build/paths/relative_path.py
+++ b/PyTeX/build/paths/relative_path.py
@@ -28,10 +28,6 @@ class RelativePath(Path):
             PyTeXRootDirType.DOC: GlobalPyTeXConfig.doc_root(),
             PyTeXRootDirType.TEX_SOURCE: GlobalPyTeXConfig.tex_root()
         }[self._pytex_root_dir_type]
-        try:
-            self._relative_path = self.relative_to(self._root_dir)
-        except ValueError as e:
-            raise NotImplementedError
 
     @property
     def root_dir_type(self) -> PyTeXRootDirType:
@@ -43,7 +39,10 @@ class RelativePath(Path):
 
     @property
     def relative_path(self):
-        return self._relative_path
+        try:
+            return self.relative_to(self._root_dir)
+        except ValueError as e:
+            raise NotImplementedError
 
 
 class RelativeWindowsPath(RelativePath, WindowsPath):