diff --git a/src/HealthGPS/static_linear_model.cpp b/src/HealthGPS/static_linear_model.cpp
index b093f707b..ac7e6cded 100644
--- a/src/HealthGPS/static_linear_model.cpp
+++ b/src/HealthGPS/static_linear_model.cpp
@@ -241,7 +241,8 @@ void StaticLinearModel::update_policies(Person &person, bool intervene) const {
     // Set zero policy if not intervening.
     if (!intervene) {
         for (size_t i = 0; i < names_.size(); i++) {
-            auto policy_name = core::Identifier{names_[i].to_string() + "_policy"};
+        for (const auto & name : names_) {
+            auto policy_name = core::Identifier{name.to_string() + "_policy"};
             person.risk_factors[policy_name] = 0.0;
         }
         return;