diff --git a/include/osg/Matrix b/include/osg/Matrix
index facd122da..6df3bd94e 100644
--- a/include/osg/Matrix
+++ b/include/osg/Matrix
@@ -13,7 +13,7 @@
 #include <iostream.h>
 #else
 #include <iostream>
-using namespace std;
+using std::ostream;
 #endif
 
 // temporary #define to keep backwards compatibility.
diff --git a/include/osg/Notify b/include/osg/Notify
index 62c71c97a..953873d73 100644
--- a/include/osg/Notify
+++ b/include/osg/Notify
@@ -13,7 +13,8 @@
 #else
 #include <iostream>
 #include <fstream>
-using namespace std;
+using std::ostream;
+using std::ofstream;
 #endif
 
 
diff --git a/include/osg/Vec2 b/include/osg/Vec2
index ed1b3d2d0..ea6a41b44 100644
--- a/include/osg/Vec2
+++ b/include/osg/Vec2
@@ -11,7 +11,7 @@
 #include <iostream.h>
 #else
 #include <iostream>
-using namespace std;
+using std::ostream;
 #endif
 
 namespace osg {
diff --git a/include/osg/Vec3 b/include/osg/Vec3
index 25ed53da4..6758b26a7 100644
--- a/include/osg/Vec3
+++ b/include/osg/Vec3
@@ -11,7 +11,7 @@
 #include <iostream.h>
 #else
 #include <iostream>
-using namespace std;
+using std::ostream;
 #endif
 
 namespace osg {
diff --git a/include/osg/Vec4 b/include/osg/Vec4
index f609a87d0..740b9a43a 100644
--- a/include/osg/Vec4
+++ b/include/osg/Vec4
@@ -11,7 +11,7 @@
 #include <iostream.h>
 #else
 #include <iostream>
-using namespace std;
+using std::ostream;
 #endif
 
 namespace osg {