diff --git a/CMakeLists.txt b/CMakeLists.txt
index 22b28a062..48df24774 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -604,7 +604,7 @@ set(RECASTNAVIGATION_DEMO OFF CACHE BOOL "Do not build RecastDemo")
 set(RECASTNAVIGATION_STATIC ON CACHE BOOL "Build recastnavigation static libraries")
 set(RECASTNAVIGATION_TESTS OFF CACHE BOOL "Do not build recastnavigation tests")
 
-add_subdirectory (extern/recastnavigation)
+add_subdirectory (extern/recastnavigation EXCLUDE_FROM_ALL)
 add_subdirectory (extern/osg-ffmpeg-videoplayer)
 add_subdirectory (extern/oics)
 if (BUILD_OPENCS)