diff --git a/backends/frotz/CMakeLists.txt b/backends/frotz/CMakeLists.txt
index 3275480c0f839d402fed27b94a224d964e5dc202..82403ab729ce4728c74acbbde894accb4e244e45 100644
--- a/backends/frotz/CMakeLists.txt
+++ b/backends/frotz/CMakeLists.txt
@@ -1,4 +1,7 @@
 cmake_minimum_required(VERSION 2.6)
+
+ADD_SUBDIRECTORY(dfrotz)
+
 FILE(GLOB SRC *.c *.cpp)
 
 ADD_EXECUTABLE(spectrum_frotz_backend ${SRC})