diff --git a/MaterialLib/MPL/CreatePhase.cpp b/MaterialLib/MPL/CreatePhase.cpp
index ccbf7668aaf7cd890c6de18b64f44b1bb313ae4f..ce2b7edb58f6f02c12885636c883c94797c0ddf6 100644
--- a/MaterialLib/MPL/CreatePhase.cpp
+++ b/MaterialLib/MPL/CreatePhase.cpp
@@ -52,7 +52,7 @@ std::unique_ptr<MaterialPropertyLib::Phase> createPhase(
                      }))
     {
         ERR("Phase type should be one of:");
-        for (auto const type : allowed_phase_types)
+        for (auto const& type : allowed_phase_types)
         {
             ERR("{:s}", type);
         }