diff --git a/.cmake.conf b/.cmake.conf
index 979edb2e37e..cdfb6df165d 100644
--- a/.cmake.conf
+++ b/.cmake.conf
@@ -32,6 +32,3 @@ set(QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_USING_QT_STATIC "3.21")
 #       in sync.
 set(QT_MIN_NEW_POLICY_CMAKE_VERSION "3.16")
 set(QT_MAX_NEW_POLICY_CMAKE_VERSION "3.21")
-
-# Use cpp-based syncqt
-set(QT_USE_SYNCQT_CPP TRUE)
diff --git a/tests/auto/cmake/mockplugins/.cmake.conf b/tests/auto/cmake/mockplugins/.cmake.conf
index edb49ceeb2e..377be0059e6 100644
--- a/tests/auto/cmake/mockplugins/.cmake.conf
+++ b/tests/auto/cmake/mockplugins/.cmake.conf
@@ -1,3 +1 @@
 set(QT_REPO_MODULE_VERSION "6.5.0")
-
-set(QT_USE_SYNCQT_CPP TRUE)