diff --git a/Tests/ConfigSources/CMakeLists.txt b/Tests/ConfigSources/CMakeLists.txt
index 1db00cc8af..9eed1c09b9 100644
--- a/Tests/ConfigSources/CMakeLists.txt
+++ b/Tests/ConfigSources/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.0)
 get_property(_isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
 if(NOT _isMultiConfig AND NOT CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE Debug CACHE STRING "Choose the type of build")
+  set(CMAKE_BUILD_TYPE Debug CACHE STRING "Choose the type of build" FORCE)
 endif()
 project(ConfigSources CXX)