diff --git a/src/osgPlugins/flt/flt2osg.cpp b/src/osgPlugins/flt/flt2osg.cpp
index 9aa2958b7..e798590ba 100644
--- a/src/osgPlugins/flt/flt2osg.cpp
+++ b/src/osgPlugins/flt/flt2osg.cpp
@@ -32,6 +32,7 @@
 #include <osg/ShapeDrawable>
 #include <osg/Quat>
 #include <osg/ProxyNode>
+#include <osg/io_utils>
 
 #include <osgSim/MultiSwitch>
 #include <osgSim/DOFTransform>
diff --git a/src/osgPlugins/ive/DataInputStream.cpp b/src/osgPlugins/ive/DataInputStream.cpp
index 3d4101015..940b7147b 100644
--- a/src/osgPlugins/ive/DataInputStream.cpp
+++ b/src/osgPlugins/ive/DataInputStream.cpp
@@ -70,6 +70,7 @@
 
 #include <osg/Endian>
 #include <osg/Notify>
+#include <osg/io_utils>
 #include <osgDB/ReadFile>
 
 
diff --git a/src/osgPlugins/ive/DataOutputStream.cpp b/src/osgPlugins/ive/DataOutputStream.cpp
index 5af3d5c20..372c81599 100644
--- a/src/osgPlugins/ive/DataOutputStream.cpp
+++ b/src/osgPlugins/ive/DataOutputStream.cpp
@@ -71,6 +71,7 @@
 #include "Shape.h"
 
 #include <osg/Notify>
+#include <osg/io_utils>
 
 using namespace ive;