diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae6135b37..62295a5d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -110,8 +110,10 @@ if(WIN32)
 	file(GLOB OS_SRC ${CMAKE_SOURCE_DIR}/src/platform/windows/*.c)
 	source_group("Windows-specific code" FILES ${OS_SRC})
 else()
-	add_definitions(-DUSE_PTHREADS -D_GNU_SOURCE)
-	list(APPEND OS_LIB pthread)
+	add_definitions(-DUSE_PTHREADS)
+	if(NOT APPLE)
+		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
+	endif()
 	file(GLOB OS_SRC ${CMAKE_SOURCE_DIR}/src/platform/posix/*.c)
 	source_group("POSIX-specific code" FILES ${OS_SRC})
 endif()