diff --git a/reactos/boot/environ/CMakeLists.txt b/reactos/boot/environ/CMakeLists.txt
index 3b043180fab..c97739bfa1e 100644
--- a/reactos/boot/environ/CMakeLists.txt
+++ b/reactos/boot/environ/CMakeLists.txt
@@ -52,6 +52,7 @@ elseif(ARCH STREQUAL "amd64")
 else()
     list(APPEND BOOTLIB_SOURCE
          lib/arch/stub/arch.c
+         lib/mm/stub/mm.c
          )
 endif()