diff --git a/CMakeLists.txt b/CMakeLists.txt
index a1ac4eb01..f6a170fda 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -203,6 +203,10 @@ if (AWS_USE_APPLE_NETWORK_FRAMEWORK)
     target_compile_definitions(${PROJECT_NAME} PUBLIC "-DAWS_USE_APPLE_NETWORK_FRAMEWORK")
 endif()
 
+if (AWS_USE_APPLE_DISPATCH_QUEUE)
+    target_compile_definitions(${PROJECT_NAME} PUBLIC "-DAWS_USE_APPLE_DISPATCH_QUEUE")
+endif()
+
 target_include_directories(${PROJECT_NAME} PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
         $<INSTALL_INTERFACE:include>)