diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b4f37a..26d82a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -240,7 +240,9 @@ endif (ENABLE_OBJCXX)
 set(CMAKE_THREAD_PREFER_PTHREAD)
 include(FindThreads)
 set(objc_LINK_FLAGS "${objc_LINK_FLAGS} ${CMAKE_THREAD_LIBS_INIT}")
-
+if(CMAKE_USE_PTHREADS_INIT)
+  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
+endif()
 
 
 add_library(objc SHARED ${libobjc_C_SRCS} ${libobjc_ASM_SRCS} ${libobjc_OBJC_SRCS} ${libobjc_CXX_SRCS})