diff --git a/src/osgPlugins/hdr/ReaderWriterHDR.cpp b/src/osgPlugins/hdr/ReaderWriterHDR.cpp
index 507b5a3b1..ae0238ebb 100644
--- a/src/osgPlugins/hdr/ReaderWriterHDR.cpp
+++ b/src/osgPlugins/hdr/ReaderWriterHDR.cpp
@@ -66,7 +66,8 @@ public:
         supportsOption("YFLIP","");
         supportsOption("NO_YFLIP","");
     }
-    virtual const char* className() { return "HDR Image Reader"; }
+
+    virtual const char* className() const { return "HDR Image Reader"; }
 
     virtual ReadResult readImage(const std::string &_file, const osgDB::ReaderWriter::Options *_opts) const
     {