diff --git a/Lib/pathlib.py b/Lib/pathlib.py
index 6369c4b..6355ae8 100644
--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -907,10 +907,16 @@
         return self._make_child(args)
 
     def __truediv__(self, key):
-        return self._make_child((key,))
+        try:
+            return self._make_child((key,))
+        except TypeError:
+            return NotImplemented
 
     def __rtruediv__(self, key):
-        return self._from_parts([key] + self._parts)
+        try:
+            return self._from_parts([key] + self._parts)
+        except TypeError:
+            return NotImplemented
 
     @property
     def parent(self):