diff --git a/CMake/options.cmake b/CMake/options.cmake
index 581f2e969..87bd31f74 100644
--- a/CMake/options.cmake
+++ b/CMake/options.cmake
@@ -132,7 +132,9 @@ endif(OPTION_USE_THREADS AND CMAKE_HAVE_THREADS_LIBRARY)
 
 if(OPTION_USE_THREADS AND CMAKE_USE_PTHREADS_INIT)
    set(HAVE_PTHREAD 1)
-   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthread")
+   if(NOT APPLE)
+     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -pthread")
+   endif(NOT APPLE)
    list(APPEND FLTK_LDLIBS -lpthread)
    list(APPEND FLTK_CFLAGS -D_THREAD_SAFE -D_REENTRANT)
    set(FLTK_PTHREADS_FOUND TRUE)