diff --git a/sys/cpu/x86_64/misc/db_disasm.c b/sys/cpu/x86_64/misc/db_disasm.c
--- a/sys/cpu/x86_64/misc/db_disasm.c
+++ b/sys/cpu/x86_64/misc/db_disasm.c
@@ -207,6 +207,7 @@
 	db_Grp7_11_010,
 	NULL,
 	NULL,
+	NULL,
 	db_Grp7_11_111,
 };