diff --git a/src/osgDB/ImageOptions.cpp b/src/osgDB/ImageOptions.cpp
index e08a094af..273eefe7e 100644
--- a/src/osgDB/ImageOptions.cpp
+++ b/src/osgDB/ImageOptions.cpp
@@ -22,4 +22,7 @@ void ImageOptions::init()
     _sourceImageWindowMode = ALL_IMAGE;
     
     _destinationImageWindowMode = ALL_IMAGE;
+    
+    _destinationDataType = GL_NONE;
+    _destinationPixelFormat = GL_NONE;
 }