diff --git a/libc/kernel/tools/cpp.py b/libc/kernel/tools/cpp.py
index 8538eb0..9f53453 100755
--- a/libc/kernel/tools/cpp.py
+++ b/libc/kernel/tools/cpp.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """A glorified C pre-processor parser."""
 
 import ctypes