diff --git a/src/ex_cmds.h b/src/ex_cmds.h
index 417945d..8eada96 100644
--- a/src/ex_cmds.h
+++ b/src/ex_cmds.h
@@ -532,7 +532,7 @@
 EX(CMD_mode,		"mode",		ex_mode,
 			WORD1|TRLBAR|CMDWIN),
 EX(CMD_mzscheme,	"mzscheme",	ex_mzscheme,
-			RANGE|EXTRA|DFLALL|NEEDARG|CMDWIN),
+			RANGE|EXTRA|DFLALL|NEEDARG|CMDWIN|SBOXOK),
 EX(CMD_mzfile,		"mzfile",	ex_mzfile,
 			RANGE|FILE1|NEEDARG|CMDWIN),
 EX(CMD_next,		"next",		ex_next,