diff --git a/src/osgQt/CMakeLists.txt b/src/osgQt/CMakeLists.txt
index 69cc12f11..6794d57cf 100644
--- a/src/osgQt/CMakeLists.txt
+++ b/src/osgQt/CMakeLists.txt
@@ -12,7 +12,7 @@ SET(SOURCES_H
     ${HEADER_PATH}/QGraphicsViewAdapter
 )
 
-QT4_WRAP_CPP( SOURCES_H_MOC ${SOURCES_H} )
+QT4_WRAP_CPP( SOURCES_H_MOC ${SOURCES_H} OPTIONS "-f" )
 
 
 SET(LIB_PUBLIC_HEADERS