diff --git a/connectivity/source/drivers/postgresql/pq_connection.hxx b/connectivity/source/drivers/postgresql/pq_connection.hxx
index 3d3bb132af74..20526ce51af3 100644
--- a/connectivity/source/drivers/postgresql/pq_connection.hxx
+++ b/connectivity/source/drivers/postgresql/pq_connection.hxx
@@ -158,7 +158,7 @@ typedef ::std::vector< OString > OStringVector;
 
 typedef std::unordered_map
 <
-    const sal_Int32,
+    sal_Int32,
     OUString,
     ::boost::hash< sal_Int32 >,
     ::std::equal_to< sal_Int32 >