diff --git a/loader/dos/dosmod.h b/loader/dos/dosmod.h
index 6545620..ee9d9f3 100644
--- a/loader/dos/dosmod.h
+++ b/loader/dos/dosmod.h
@@ -3,6 +3,7 @@
 
 #define DOSMOD_ENTER     0x01 /* VM86_ENTER */
 #define DOSMOD_SET_TIMER 0x10
+#define DOSMOD_GET_TIMER 0x11
 
 #define DOSMOD_SIGNAL 0x00 /* VM86_SIGNAL */