diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f7e489..ebea511 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,9 +2,9 @@ cmake_minimum_required(VERSION 3.9)
 project(LO41 C)
 
 set(CMAKE_C_STANDARD 11)
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror -Wextra -Wshadow")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror -Wextra -Wshadow -fpic")
 
-if("${CMAKE_SYSTEM}" MATCHES "Linux")
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
 endif()