diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc189df5ea..7802277a0a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,6 +5,14 @@
 # LICENSE file in the root directory of this source tree.
 
 cmake_minimum_required(VERSION 3.10)
+
+# Support: HHVM OSS
+# HHVM needs to supply overrides for some module search paths
+# to use vendored equivalents of system dependencies.
+if(POLICY CMP0074)
+  cmake_policy(SET CMP0074 NEW)
+endif()
+
 include(CheckCXXCompilerFlag)
 
 project(