diff --git a/Tests/SwiftOnly/CMakeLists.txt b/Tests/SwiftOnly/CMakeLists.txt
index 41d14eae88..01c2222dc1 100644
--- a/Tests/SwiftOnly/CMakeLists.txt
+++ b/Tests/SwiftOnly/CMakeLists.txt
@@ -1,4 +1,7 @@
 cmake_minimum_required(VERSION 3.3)
+if(POLICY CMP0126)
+  cmake_policy(SET CMP0126 NEW)
+endif()
 
 # NOTE: Force the Release mode configuration as there are some issues with the
 # debug information handling on macOS on certain Xcode builds.