diff --git a/cmake/QtAutoDetect.cmake b/cmake/QtAutoDetect.cmake
index 17c0beac223..cbbda362b55 100644
--- a/cmake/QtAutoDetect.cmake
+++ b/cmake/QtAutoDetect.cmake
@@ -177,8 +177,8 @@ function(qt_auto_detect_vcpkg)
         endif()
         set(CMAKE_TOOLCHAIN_FILE "${vcpkg_toolchain_file}" CACHE STRING "" FORCE)
         message(STATUS "Using vcpkg from $ENV{VCPKG_ROOT}")
-        if(DEFINED ENV{VCPKG_DEFAULT_TRIPLET} AND NOT DEFINED VCPKG_TARGET_TRIPLET)
-            set(VCPKG_TARGET_TRIPLET "$ENV{VCPKG_DEFAULT_TRIPLET}" CACHE STRING "")
+        if(DEFINED ENV{QT_VCPKG_TARGET_TRIPLET} AND NOT DEFINED VCPKG_TARGET_TRIPLET)
+            set(VCPKG_TARGET_TRIPLET "$ENV{QT_VCPKG_TARGET_TRIPLET}" CACHE STRING "")
             message(STATUS "Using vcpkg triplet ${VCPKG_TARGET_TRIPLET}")
         endif()
         unset(vcpkg_toolchain_file)