diff --git a/setup.py b/setup.py
index a86527ace092b..c5cd9afe3f9bb 100755
--- a/setup.py
+++ b/setup.py
@@ -277,6 +277,7 @@ def initialize_options(self):
                     ".pyo",
                     ".pyd",
                     ".c",
+                    ".cpp",
                     ".orig",
                 ):
                     self._clean_me.append(filepath)