diff --git a/src/sysen1/ddt.1548 b/src/sysen1/ddt.1549
similarity index 99%
rename from src/sysen1/ddt.1548
rename to src/sysen1/ddt.1549
index 0b7620407..fc91af11a 100755
--- a/src/sysen1/ddt.1548
+++ b/src/sysen1/ddt.1549
@@ -954,9 +954,10 @@ bret:	    aos -1(p)
 mchok0:	camn a,[sixbit /DSK/]  ;is this the local machine?
 	  jrst [ move a,itsnam ? jrst popj1]  ;then use that instead
 	movsi b,-mchcnt		;for all the machines
-mchok1:	camn a,mchtab(b)	;is it this one?
+mchok1:	skipn mchtab(b)		;empty table entry?
+	  ret			;  yes, exit early
+	camn a,mchtab(b)	;is it this one?
 	  jrst popj1		;  yes, it's OK
-	skipe mchtab(b)
 	aobjn b,mchok1		;no, try next
 	ret