diff --git a/CMakeLists.txt b/CMakeLists.txt
index 31f20a40..a4ef9882 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,7 +12,7 @@ set (CMAKE_CXX_EXTENSIONS OFF)
 
 # -Wshorten-64-to-32 does not work with clang
 if (NOT WIN32)
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -Wshorten-64-to-32")
 endif()
 
 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")