diff --git a/src/App/VarSet.cpp b/src/App/VarSet.cpp
index 9e9fdc9305..a8ea0fe5a3 100644
--- a/src/App/VarSet.cpp
+++ b/src/App/VarSet.cpp
@@ -20,7 +20,11 @@
  *                                                                          *
  ****************************************************************************/
 
+#include "PreCompiled.h"
+
+#ifndef _PreComp_
 #include <iostream>
+#endif
 
 #include "VarSet.h"
 #include "DocumentObject.h"