diff --git a/cmake/QtAutoDetect.cmake b/cmake/QtAutoDetect.cmake
index 5652124d915..cbfd5826db4 100644
--- a/cmake/QtAutoDetect.cmake
+++ b/cmake/QtAutoDetect.cmake
@@ -171,7 +171,7 @@ function(qt_auto_detect_vcpkg)
         if(DEFINED CMAKE_TOOLCHAIN_FILE)
             get_filename_component(supplied_toolchain_file "${CMAKE_TOOLCHAIN_FILE}" ABSOLUTE)
             if(NOT supplied_toolchain_file STREQUAL vcpkg_toolchain_file)
-                set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE "${CMAKE_TOOLCHAIN_FILE}" CACHE STRING "")
+                set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE "${supplied_toolchain_file}" CACHE STRING "")
             endif()
             unset(supplied_toolchain_file)
         endif()