diff --git a/tests/scripts/check-names.py b/tests/scripts/check-names.py
index b8a12885f1..5fe85b7bd6 100755
--- a/tests/scripts/check-names.py
+++ b/tests/scripts/check-names.py
@@ -540,6 +540,8 @@ class NameCheck():
             self.set_return_code(2)
             raise error
         finally:
+            # Put back the original config regardless of there being errors.
+            # Works also for keyboard interrupts.
             shutil.move("include/mbedtls/mbedtls_config.h.bak",
                         "include/mbedtls/mbedtls_config.h")