diff --git a/src/GEOMClient/GEOM_Client.cxx b/src/GEOMClient/GEOM_Client.cxx
index 3e8eb2058..5f89234b9 100644
--- a/src/GEOMClient/GEOM_Client.cxx
+++ b/src/GEOMClient/GEOM_Client.cxx
@@ -26,6 +26,8 @@
 //  Module : GEOM
 //  $Header$
 
+using namespace std;
+
 #include <Standard_Stream.hxx>
 
 #include <Standard_Stream.hxx>