diff --git a/Netgen/nglib_addon.cpp b/Netgen/nglib_addon.cpp
index 8e196fb8e48167fccb8459e0a05f1bccce4444a9..fb42b7c511dad850235d8b444784801035c1d561 100644
--- a/Netgen/nglib_addon.cpp
+++ b/Netgen/nglib_addon.cpp
@@ -6,7 +6,7 @@
 
 using namespace netgen;
 
-#include <iostream.h>
+#include <iostream>
 #include "Message.h"
 
 class mystreambuf: public streambuf