diff --git a/postgres.go b/postgres.go
index ef4c902d..14b4a329 100644
--- a/postgres.go
+++ b/postgres.go
@@ -100,7 +100,7 @@ func (h Hstore) Value() (driver.Value, error) {
 	}
 
 	for key, value := range h {
-		hstore.Map[key] = sql.NullString{*value, true}
+		hstore.Map[key] = sql.NullString{String: *value, Valid: true}
 	}
 	return hstore.Value()
 }