diff --git a/include/minix/com.h b/include/minix/com.h
index a4e71b56e..5358c1784 100755
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -592,6 +592,7 @@
 #define VMCTL_MEMREQ_GET	14
 #define VMCTL_MEMREQ_REPLY	15
 #define VMCTL_INCSP		16
+#define VMCTL_STACKTRACE	17
 
 /*===========================================================================*
  *                Messages for the Reincarnation Server 		     *