diff --git a/CMakeLists.txt b/CMakeLists.txt
index e4d6793..07810da 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ cmake_minimum_required (VERSION 2.8.11)
 project (cpp-jwt)
 
 #SET (CMAKE_CXX_COMPILER /usr/local/bin/g++)
-SET( CMAKE_CXX_FLAGS  "-std=c++14 -Wall" )
+SET( CMAKE_CXX_FLAGS  "-std=c++14 -Wall -Wextra" )
 
 include_directories (include)