diff --git a/CMakeLists.txt b/CMakeLists.txt
index f91dfeacb5e6d..ab3db04ebca58 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1550,6 +1550,10 @@ else()
   # Some of the things below depend on the threading library
   add_subdirectory(stdlib/public/Threading)
 
+  if(SWIFT_BUILD_SWIFT_DIRECT_RUNTIME)
+    add_subdirectory(stdlib/public/SwiftDirectRuntime)
+  endif()
+
   if(SWIFT_BUILD_STDLIB_EXTRA_TOOLCHAIN_CONTENT)
     add_subdirectory(stdlib/toolchain)