diff --git a/phosphor-ldap-mapper/ldap_mapper_serialize.cpp b/phosphor-ldap-mapper/ldap_mapper_serialize.cpp
index b0124c2..728b3fa 100644
--- a/phosphor-ldap-mapper/ldap_mapper_serialize.cpp
+++ b/phosphor-ldap-mapper/ldap_mapper_serialize.cpp
@@ -81,7 +81,7 @@
         }
         return false;
     }
-    catch (cereal::Exception& e)
+    catch (const cereal::Exception& e)
     {
         log<level::ERR>(e.what());
         std::filesystem::remove(path);