diff --git a/src/lib/OpenEXR/ImfTiledRgbaFile.h b/src/lib/OpenEXR/ImfTiledRgbaFile.h
index 8e8f5a5aa4..93880929ec 100644
--- a/src/lib/OpenEXR/ImfTiledRgbaFile.h
+++ b/src/lib/OpenEXR/ImfTiledRgbaFile.h
@@ -305,7 +305,7 @@ class IMF_EXPORT_TYPE TiledRgbaOutputFile
 // Tiled RGBA input file
 //
 
-class TiledRgbaInputFile
+class IMF_EXPORT_TYPE TiledRgbaInputFile
 {
   public: