diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4423dcc..73685ff 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,8 +17,8 @@ if (APPLE)
     set (OSX_SDK_VERSION 10.9)
     set (CMAKE_OSX_SYSROOT "/Developer/SDKs/MacOSX${OSX_SDK_VERSION}.sdk/")
     set (CMAKE_OSX_DEPLOYMENT_TARGET ${OSX_SDK_VERSION})
-    set (CMD_CXXFLAGS "--sysroot ${CMAKE_OSX_SYSROOT} -mmacosx-version-min=${OSX_SDK_VERSION} ${CMAKE_CXX_FLAGS}")
-    set (CMD_CFLAGS "--sysroot ${CMAKE_OSX_SYSROOT} -mmacosx-version-min=${OSX_SDK_VERSION} ${CMAKE_C_FLAGS}")
+    set (CMD_CXXFLAGS "-isysroot ${CMAKE_OSX_SYSROOT} -mmacosx-version-min=${OSX_SDK_VERSION} ${CMAKE_CXX_FLAGS}")
+    set (CMD_CFLAGS "-isysroot ${CMAKE_OSX_SYSROOT} -mmacosx-version-min=${OSX_SDK_VERSION} ${CMAKE_C_FLAGS}")
   endif ()
   set (CMD_CPPFLAGS "-I${CMAKE_BINARY_DIR}/include")
 endif ()