diff --git a/src/share/3rdparty/package-manager/auto-setup.cmake b/src/share/3rdparty/package-manager/auto-setup.cmake
index 249a936ce8c..968f1ebeb24 100644
--- a/src/share/3rdparty/package-manager/auto-setup.cmake
+++ b/src/share/3rdparty/package-manager/auto-setup.cmake
@@ -319,7 +319,8 @@ macro(qtc_auto_setup_vcpkg)
         elseif (WIN32)
           set(vcpkg_triplet x64-mingw-static)
           if (CMAKE_CXX_COMPILER MATCHES ".*/(.*)/cl.exe")
-            set(vcpkg_triplet ${CMAKE_MATCH_1}-windows)
+            string(TOLOWER ${CMAKE_MATCH_1} host_arch_lowercase)
+            set(vcpkg_triplet ${host_arch_lowercase}-windows)
           endif()
         elseif(APPLE)
           # We're too early to use CMAKE_HOST_SYSTEM_PROCESSOR