diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c1a9ee..8204382 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,8 +47,8 @@ if(FORT_COMPILER STREQUAL "MSVC")
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W4")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -W4")
 else(FORT_COMPILER STREQUAL "MSVC")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -g")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -g")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -g -Wextra")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -g -Wextra")
 endif(FORT_COMPILER STREQUAL "MSVC")