diff --git a/IO/PostgreSQL/vtkPostgreSQLQuery.cxx b/IO/PostgreSQL/vtkPostgreSQLQuery.cxx
index 35c907cb9b4a8fdb1a6665922749fd473d3d93dc..4686d4895cb018348c9a50adb890438ae15e97a8 100644
--- a/IO/PostgreSQL/vtkPostgreSQLQuery.cxx
+++ b/IO/PostgreSQL/vtkPostgreSQLQuery.cxx
@@ -34,7 +34,6 @@ DECLARE_CONVERTER(UnsignedLong);
 DECLARE_CONVERTER(Float);
 DECLARE_CONVERTER(Double);
 DECLARE_CONVERTER(VtkIdType);
-DECLARE_CONVERTER(String);
 DECLARE_CONVERTER(SignedLongLong);
 DECLARE_CONVERTER(UnsignedLongLong);