diff --git a/3d-viewer/3d_cache/CMakeLists.txt b/3d-viewer/3d_cache/CMakeLists.txt
index 82ed6dec69..cc06e9deb7 100644
--- a/3d-viewer/3d_cache/CMakeLists.txt
+++ b/3d-viewer/3d_cache/CMakeLists.txt
@@ -1,3 +1 @@
-# unset CMAKE_CXX_FLAGS because it's contaminated with too many options
-set( CMAKE_CXX_FLAGS "" )
 add_subdirectory( sg )