diff --git a/include/matador/sql/column.hpp b/include/matador/sql/column.hpp
index 1defa9c..4df3d36 100644
--- a/include/matador/sql/column.hpp
+++ b/include/matador/sql/column.hpp
@@ -21,9 +21,9 @@ struct column
   column(const char *name); // NOLINT(*-explicit-constructor)
   column(std::string name); // NOLINT(*-explicit-constructor)
   column(sql_function_t func, std::string name); // NOLINT(*-explicit-constructor)
-  column(std::string table_name, std::string name, std::string as);
-  column(std::string table_name, const char* name, std::string as);
-  column(struct table &t, const char* name, std::string as);
+  column(std::string table_name, std::string name, std::string as = "");
+  column(std::string table_name, const char* name, std::string as = "");
+  column(struct table &t, const char* name, std::string as = "");
 
   [[nodiscard]] bool equals(const column &x) const;