diff --git a/src/Marten/Linq/Members/DuplicatedField.cs b/src/Marten/Linq/Members/DuplicatedField.cs
index b653637b21..45c6a90977 100644
--- a/src/Marten/Linq/Members/DuplicatedField.cs
+++ b/src/Marten/Linq/Members/DuplicatedField.cs
@@ -197,7 +197,7 @@ void ISqlFragment.Apply(ICommandBuilder builder)
 
     public string UpdateSqlFragment()
     {
-        return $"{ColumnName} = {InnerMember.SelectorForDuplication(PgType)}";
+        return $"\"{ColumnName}\" = {InnerMember.SelectorForDuplication(PgType)}";
     }
 
     public static DuplicatedField For<T>(StoreOptions options, Expression<Func<T, object>> expression,