diff --git a/CMakeLists.txt b/CMakeLists.txt
index cb0103d9..1650a439 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -101,7 +101,7 @@ if(WIN32)
         #     SET(WARNING_FLAGS "${WARNING_FLAGS} /wd${warning}")
         # endforeach(warning)
         
-        set(MSVC_FLAGS "-DNOMINMAX -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS -D__CRT_NONSTDC_NO_WARNINGS -DNO_OPENSCENEGRAPH_INTERFACE -DNO_TIMER")
+        set(MSVC_FLAGS "-DNOMINMAX -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS -D__CRT_NONSTDC_NO_WARNINGS -DNO_TIMER")
         if (${MSVC_VERSION} EQUAL 1600)
 		  set( MSVC_LD_FLAGS "/FORCE:MULTIPLE" )
         endif (${MSVC_VERSION} EQUAL 1600)
@@ -111,7 +111,7 @@ if(WIN32)
 endif(WIN32)    
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${WARNING_FLAGS} ${MSVC_FLAGS} -D_REENTRANT")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS} ${MSVC_FLAGS} -D_REENTRANT")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WARNING_FLAGS} ${MSVC_FLAGS} -D_REENTRANT -DNO_OPENSCENEGRAPH_INTERFACE")
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${MSVC_LD_FLAGS}")
 
 include_directories(