diff --git a/src/osgDB/CMakeLists.txt b/src/osgDB/CMakeLists.txt
index be9c3f5d8..94cf5e3e3 100644
--- a/src/osgDB/CMakeLists.txt
+++ b/src/osgDB/CMakeLists.txt
@@ -105,7 +105,7 @@ IF(OPENVRML_FOUND)
 ENDIF(OPENVRML_FOUND)
 
 
-ADD_DEFINITIONS(-DOSG_PLUGIN_EXTENSION=${CMAKE_SHARED_LIBRARY_SUFFIX})
+ADD_DEFINITIONS(-DOSG_PLUGIN_EXTENSION=${CMAKE_SHARED_MODULE_SUFFIX})
 
 LINK_INTERNAL(${LIB_NAME}     
     osg