diff --git a/code/nel/tools/3d/object_viewer_qt/src/plugins/example/CMakeLists.txt b/code/nel/tools/3d/object_viewer_qt/src/plugins/example/CMakeLists.txt
index b6a457c6e..43a492fa5 100644
--- a/code/nel/tools/3d/object_viewer_qt/src/plugins/example/CMakeLists.txt
+++ b/code/nel/tools/3d/object_viewer_qt/src/plugins/example/CMakeLists.txt
@@ -10,6 +10,6 @@ NL_DEFAULT_PROPS(ovqt_plugin_example "NeL, Tools, 3D: Object Viewer Qt Plugin: E
 NL_ADD_RUNTIME_FLAGS(ovqt_plugin_example)
 NL_ADD_LIB_SUFFIX(ovqt_plugin_example)
 
-ADD_DEFINITIONS(${LIBXML2_DEFINITIONS})
+ADD_DEFINITIONS(${LIBXML2_DEFINITIONS} -DQT_PLUGIN)
 
 INSTALL(TARGETS ovqt_plugin_example LIBRARY DESTINATION lib RUNTIME DESTINATION bin ARCHIVE DESTINATION lib COMPONENT tools3d)