diff --git a/src/AudioToolbox/CMakeLists.txt b/src/AudioToolbox/CMakeLists.txt
index c3d10bfc0..846b9b4ae 100644
--- a/src/AudioToolbox/CMakeLists.txt
+++ b/src/AudioToolbox/CMakeLists.txt
@@ -9,7 +9,7 @@ endif(COMMAND cmake_policy)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -fblocks -ggdb -O0")
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--version-script=${DARLING_TOP_DIRECTORY}/darwin.map")
 
-add_definitions(-DOBJC2RUNTIME -U__APPLE__)
+add_definitions(-DOBJC2RUNTIME -U__APPLE__ -DDISPATCH_NO_INCLUDE_MACH_HEADERS=1)
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/..)
diff --git a/src/AudioUnit/CMakeLists.txt b/src/AudioUnit/CMakeLists.txt
index 09106369c..d3d22ac62 100644
--- a/src/AudioUnit/CMakeLists.txt
+++ b/src/AudioUnit/CMakeLists.txt
@@ -30,7 +30,7 @@ endif (ENABLE_PULSEAUDIO)
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -fblocks -ggdb -O0")
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--version-script=${DARLING_TOP_DIRECTORY}/darwin.map")
 
-add_definitions(-DOBJC2RUNTIME -U__APPLE__)
+add_definitions(-DOBJC2RUNTIME -U__APPLE__ -DDISPATCH_NO_INCLUDE_MACH_HEADERS=1)
 
 include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/..)