diff --git a/utils/build.ps1 b/utils/build.ps1
index 9cf1b37708ba1..627148a2f8c0b 100644
--- a/utils/build.ps1
+++ b/utils/build.ps1
@@ -3523,6 +3523,7 @@ function Build-Subprocess([Hashtable] $Platform) {
     -Defines @{
       BUILD_SHARED_LIBS = "NO";
       CMAKE_STATIC_LIBRARY_PREFIX_Swift = "lib";
+      SwiftSystem_DIR = (Get-ProjectCMakeModules $Platform System);
     }
 }