diff --git a/src/sqlite3_lib.erl b/src/sqlite3_lib.erl
index bb6b796..dc2addb 100644
--- a/src/sqlite3_lib.erl
+++ b/src/sqlite3_lib.erl
@@ -349,6 +349,7 @@ constraint_sql(Constraint) ->
         unique -> "UNIQUE";
         not_null -> "NOT NULL";
         {default, DefaultValue} -> ["DEFAULT ", value_to_sql(DefaultValue)];
+        {raw, S} when is_list(S) -> S;
         _ when is_list(Constraint) -> map_intersperse(fun constraint_sql/1, Constraint, " ")
     end.