diff --git a/CMakeLists.txt b/CMakeLists.txt
index ebea511..16e6c41 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ project(LO41 C)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror -Wextra -Wshadow -fpic")
 
-if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+if(CMAKE_COMPILER_IS_GNUCC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
 endif()