diff --git a/Source/Apps/Build.cmd b/Source/Apps/Build.cmd
index cd71ed07..6ead2264 100644
--- a/Source/Apps/Build.cmd
+++ b/Source/Apps/Build.cmd
@@ -33,6 +33,7 @@ pushd FAT && call Build || exit /b & popd
 pushd Test && call Build || exit /b & popd
 pushd ZMP && call Build || exit /b & popd
 pushd ZMD && call Build || exit /b & popd
+pushd Dev && call Build || exit /b & popd
 
 copy *.com %APPBIN%\ || exit /b
 
diff --git a/Source/Apps/Clean.cmd b/Source/Apps/Clean.cmd
index 22259b3a..88cc92e6 100644
--- a/Source/Apps/Clean.cmd
+++ b/Source/Apps/Clean.cmd
@@ -14,3 +14,4 @@ pushd FAT && call Clean || exit /b 1 & popd
 pushd Test && call Clean || exit /b 1 & popd
 pushd ZMP && call Clean || exit /b 1 & popd
 pushd ZMD && call Clean || exit /b 1 & popd
+pushd Dev && call Clean || exit /b 1 & popd
diff --git a/Source/Apps/Makefile b/Source/Apps/Makefile
index ea2decb0..5a77bb5e 100644
--- a/Source/Apps/Makefile
+++ b/Source/Apps/Makefile
@@ -1,7 +1,7 @@
 OBJECTS = sysgen.com survey.com \
 	syscopy.com assign.com format.com talk.com mode.com rtc.com \
 	timer.com rtchb.com
-SUBDIRS = XM FDU FAT Tune Test ZMP ZMD
+SUBDIRS = XM FDU FAT Tune Test ZMP ZMD Dev
 DEST = ../../Binary/Apps
 TOOLS =../../Tools