diff --git a/examples/app/CMakeLists.txt b/examples/app/CMakeLists.txt
index c811f336..4efaa4db 100644
--- a/examples/app/CMakeLists.txt
+++ b/examples/app/CMakeLists.txt
@@ -2,6 +2,8 @@ cmake_minimum_required(VERSION 3.16)
 
 project(app LANGUAGES C)
 
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wvla -Werror")
+
 find_package(toywasm-lib-core REQUIRED)
 
 set(app_sources