diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 10b9ed7..f09fb3b 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -479,7 +479,7 @@
 	EX_BANG|EX_EXTRA|EX_TRLBAR|EX_CMDWIN,
 	ADDR_NONE),
 EXCMD(CMD_disassemble,	"disassemble",	ex_disassemble,
-	EX_EXTRA|EX_TRLBAR|EX_CMDWIN,
+	EX_EXTRA|EX_NEEDARG|EX_TRLBAR|EX_CMDWIN,
 	ADDR_NONE),
 EXCMD(CMD_djump,	"djump",	ex_findpat,
 	EX_BANG|EX_RANGE|EX_DFLALL|EX_WHOLEFOLD|EX_EXTRA,