diff --git a/CMakeLists.txt b/CMakeLists.txt
index 46cc78d..bd07107 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,8 +48,8 @@ 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 "${CMAKE_C_FLAGS} -Wall -g -Wextra -std=c99 -Wpedantic")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -g -Wextra -std=c++11")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -g -Wextra -Werror -std=c99 -Wpedantic")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -g -Wextra -Werror -std=c++11")
 endif("${FORT_COMPILER}" STREQUAL "MSVC")