diff --git a/CMakeLists.txt b/CMakeLists.txt
index 74b09e3a0..4d9ee9d41 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,7 +18,7 @@ cmake_minimum_required(VERSION 3.16)
 cmake_policy(SET CMP0091 NEW)
 cmake_policy(SET CMP0079 NEW)
 
-if(QT)
+if(NOT DEFINED QT OR QT)
     list(APPEND VCPKG_MANIFEST_FEATURES "qt-ui")
 endif()