diff --git a/src/osgPlugins/jp2/CMakeLists.txt b/src/osgPlugins/jp2/CMakeLists.txt
index 24b070167..a4aded99e 100644
--- a/src/osgPlugins/jp2/CMakeLists.txt
+++ b/src/osgPlugins/jp2/CMakeLists.txt
@@ -4,5 +4,10 @@ SET(TARGET_SRC ReaderWriterJP2.cpp )
 
 SET(TARGET_LIBRARIES_VARS JASPER_LIBRARY )
 
+IF(WIN32)
+   ADD_DEFINITIONS(-DJAS_WIN_MSVC_BUILD)
+ENDIF(WIN32)
+
+
 #### end var setup  ###
 SETUP_PLUGIN(jp2)