diff --git a/ios/PRESUBMIT.py b/ios/PRESUBMIT.py
index 8fdaae9bc9deb1..6c76d51ea27f86 100644
--- a/ios/PRESUBMIT.py
+++ b/ios/PRESUBMIT.py
@@ -10,6 +10,8 @@
 
 import os
 
+USE_PYTHON3 = True
+
 NULLABILITY_PATTERN = r'(nonnull|nullable|_Nullable|_Nonnull)'
 TODO_PATTERN = r'TO[D]O\(([^\)]*)\)'
 CRBUG_PATTERN = r'crbug\.com/\d+$'