diff --git a/src/osgPlugins/exr/ReaderWriterEXR.cpp b/src/osgPlugins/exr/ReaderWriterEXR.cpp
index d1c53299c..9e2ebbd07 100644
--- a/src/osgPlugins/exr/ReaderWriterEXR.cpp
+++ b/src/osgPlugins/exr/ReaderWriterEXR.cpp
@@ -4,8 +4,10 @@
 #include <osg/Image>
 #include <osg/GL>
 
+#ifdef _WIN32
 //Make the half format work against openEXR libs 
-// #define OPENEXR_DLL
+#define OPENEXR_DLL
+#endif
 
 #include <osgDB/Registry>
 #include <osgDB/FileNameUtils>