diff --git a/backends/postgres/src/postgres_connection.cpp b/backends/postgres/src/postgres_connection.cpp
index 1985bc5..eabf5fe 100644
--- a/backends/postgres/src/postgres_connection.cpp
+++ b/backends/postgres/src/postgres_connection.cpp
@@ -3,12 +3,13 @@
 #include "postgres_result_reader.hpp"
 #include "postgres_statement.hpp"
 
+#include "matador/object/attribute_definition.hpp"
+
 #include "matador/sql/error_code.hpp"
 #include "matador/sql/record.hpp"
 
 #include "matador/sql/internal/query_result_impl.hpp"
 
-
 #include <sstream>
 
 namespace matador::backends::postgres {
@@ -198,9 +199,9 @@ utils::result<std::vector<object::attribute_definition>, utils::error> postgres_
     // Todo: extract size
     auto type = (string2type(reader.column(2)));
     end = nullptr;
-    sql::null_option null_opt{sql::null_option::NULLABLE};
+    object::null_option null_opt{object::null_option::NULLABLE};
     if (strtoul(reader.column(4), &end, 10) == 0) {
-      null_opt = sql::null_option::NOT_NULL;
+      null_opt = object::null_option::NOT_NULL;
     }
     // f.default_value(res->column(4));
     prototype.emplace_back(name, type, utils::null_attributes, null_opt, index);