diff --git a/CMakeLists.txt b/CMakeLists.txt
index 851d4a2..543edf4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -438,9 +438,9 @@ SET(MAIKO_HDRS
     inc/z2defs.h
 )
 
-ADD_CUSTOM_TARGET(gen-vdate
+ADD_CUSTOM_COMMAND(OUTPUT vdate.c
   COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/bin/mkvdate > vdate.c
-  BYPRODUCTS vdate.c
+  DEPENDS ${MAIKO_SRCS} ${MAIKO_HDRS} ${MAIKO_DISPLAY_X11_SRCS} ${MAIKO_DISPLAY_X11_HDRS} ${MAIKO_DISPLAY_SDL_SRCS} ${MAIKO_DISPLAY_SDL_HDRS} 
 )
 
 ADD_EXECUTABLE(lde src/ldeboot.c src/unixfork.c)