diff --git a/HACKING.txt b/HACKING.txt
index 5785b3072..f614b6904 100644
--- a/HACKING.txt
+++ b/HACKING.txt
@@ -135,7 +135,7 @@ Adding a system call usually involves:
   3. Add constants (and perhaps types) to the appropriate header file.
      Note that you should check to see whether the constants are already in
      kernel uapi header files, in which case you just need to make sure that
-     that appropriate POSIX header file in libc/include/ includes the
+     the appropriate POSIX header file in libc/include/ includes the
      relevant file or files.
   4. Add function declarations to the appropriate header file.
   5. Add at least basic tests. Even a test that deliberately supplies