diff --git a/src/system/nmtape.30 b/src/system/nmtape.30
index a76bc0c4..0b2e7bc7 100755
--- a/src/system/nmtape.30
+++ b/src/system/nmtape.30
@@ -2033,7 +2033,7 @@ MGVTC1:	IORDI T,%TMCS1		;Get status
 	TXNE T,%TM1TE\%TM1MP	;Controller error?
 	 JRST MGERR		;Yes, bad
 	IORDI T,%TMFS		;Get formatter status
-	TXNE T,%TMSES		;Formatter error?
+	TXNN T,%TMSES		;Formatter error?
 	 JRST MGNVT		;No error, not a new tape
 	IORDI T,%TMERR		;Get formatter error register
 	TXNE T,%TMEFC		;Frame Count error?