diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e6cafdbd..ae57dc376 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 2.8.4)
 project(monad_native)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall")
 
 #include gtest
 include_directories(../ext-src/gtest/fused-src impl)