diff --git a/cpp/cmake_modules/ThirdpartyToolchain.cmake b/cpp/cmake_modules/ThirdpartyToolchain.cmake
index 098724ccf7303..5332aaaec6bbd 100644
--- a/cpp/cmake_modules/ThirdpartyToolchain.cmake
+++ b/cpp/cmake_modules/ThirdpartyToolchain.cmake
@@ -5067,7 +5067,6 @@ macro(build_azure_sdk)
 
   set(AZURESDK_PREFIX "${CMAKE_CURRENT_BINARY_DIR}/azuresdk_ep-install")
   set(AZURESDK_INCLUDE_DIR "${AZURESDK_PREFIX}/include")
-  set(AZURESDK_LIB_DIR "lib")
 
   set(AZURESDK_COMMON_CMAKE_ARGS
       ${EP_COMMON_CMAKE_ARGS}