diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 9519890..eba4158 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -62,6 +62,8 @@
     r'src[\\\/]compiler[\\\/]ast-graph-builder\.cc',
     # Test extension.
     r'src[\\\/]extensions[\\\/]gc-extension\.cc',
+    # Runtime functions used for testing.
+    r'src[\\\/]runtime[\\\/]runtime-test\.cc',
 )