diff --git a/util/test/demos/CMakeLists.txt b/util/test/demos/CMakeLists.txt
index 255a6ecf6..3fdd663ae 100644
--- a/util/test/demos/CMakeLists.txt
+++ b/util/test/demos/CMakeLists.txt
@@ -219,7 +219,7 @@ project(demos)
 
 if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-    list(APPEND warning_flags -Werror -Wno-unused-result)
+    list(APPEND warning_flags -Werror -Wno-unused-result -Wno-nullability-completeness)
     string(REPLACE ";" " " warning_flags "${warning_flags}")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${warning_flags}")
 endif()