diff --git a/infra/gcb/build_project.py b/infra/gcb/build_project.py
index 7f233c196..24b3d0afe 100644
--- a/infra/gcb/build_project.py
+++ b/infra/gcb/build_project.py
@@ -98,7 +98,7 @@ def get_sanitizers(project_yaml):
     if isinstance(sanitizer, six.string_types):
       processed_sanitizers.append(sanitizer)
     elif isinstance(sanitizer, dict):
-      for key in sanitizer.iterkeys():
+      for key in sanitizer.keys():
         processed_sanitizers.append(key)
 
   return processed_sanitizers