diff --git a/src/osg/DisplaySettings.cpp b/src/osg/DisplaySettings.cpp
index 2bc9466fd..8f4851b8d 100644
--- a/src/osg/DisplaySettings.cpp
+++ b/src/osg/DisplaySettings.cpp
@@ -17,6 +17,7 @@
 #include <osg/ref_ptr>
 
 #include <algorithm>
+#include <string.h>
 
 using namespace osg;
 using namespace std;
diff --git a/src/osg/Image.cpp b/src/osg/Image.cpp
index 271a9b807..4c3931c95 100644
--- a/src/osg/Image.cpp
+++ b/src/osg/Image.cpp
@@ -24,6 +24,8 @@
 #include <osg/Texture3D>
 #include <osg/Texture2DArray>
 
+#include <string.h>
+
 #include "dxtctool.h"
 
 using namespace osg;