diff --git a/include/sqlpp11/functions.h b/include/sqlpp11/functions.h
index 143ddc61..46776612 100644
--- a/include/sqlpp11/functions.h
+++ b/include/sqlpp11/functions.h
@@ -109,7 +109,7 @@ namespace sqlpp
 			{
 				if (t._container.size() == 1)
 				{
-					return serialize(value(t._container[0]), context);
+					return serialize(value(*begin(t._container)), context);
 				}
 
 				bool first = true;