diff --git a/CMakeLists.txt b/CMakeLists.txt
index ad33c03b..b8e01207 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -140,6 +140,7 @@ if (ASYNC_SIMPLE_ENABLE_ASAN)
 endif()
 
 # Start Detecing Uthread
+set(UTHREAD OFF)
 if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux") # uname -s
   if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "x86_64|aarch64|ppc64le") # uname -m
     set(UTHREAD ON)