diff --git a/c_src/sqlite3_drv.c b/c_src/sqlite3_drv.c
index 9a7b058..6d568ee 100644
--- a/c_src/sqlite3_drv.c
+++ b/c_src/sqlite3_drv.c
@@ -433,7 +433,7 @@ static int bind_parameters(
       return output_error(drv, SQLITE_ERROR,
                           "error while binding parameters");
     }
-    acc_string = driver_alloc(sizeof(char*) * (*p_size + 1));
+    acc_string = driver_alloc(sizeof(char) * (*p_size + 1));
     ei_decode_string(buffer, p_index, acc_string);
     for (param_index = 1; param_index <= *p_size; param_index++) {
       sqlite3_bind_int(statement, param_index, (int) (unsigned char) acc_string[param_index - 1]);
diff --git a/src/sqlite3_lib.erl b/src/sqlite3_lib.erl
index b048e7e..970a5b8 100644
--- a/src/sqlite3_lib.erl
+++ b/src/sqlite3_lib.erl
@@ -364,6 +364,7 @@ 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.