diff --git a/src/SMESH/SMESH_Pattern.hxx b/src/SMESH/SMESH_Pattern.hxx
index df1ccd0eb..3a3278914 100644
--- a/src/SMESH/SMESH_Pattern.hxx
+++ b/src/SMESH/SMESH_Pattern.hxx
@@ -21,6 +21,8 @@
 // Created   : Mon Aug  2 10:30:00 2004
 // Author    : Edward AGAPOV (eap)
 
+using namespace std;
+
 #ifndef SMESH_Pattern_HeaderFile
 #define SMESH_Pattern_HeaderFile