diff --git a/src/buffer.c b/src/buffer.c
index d1907a4..fd94a27 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -2793,6 +2793,8 @@
 		(buf->b_flags & BF_READERR) ? 'x'
 					    : (bufIsChanged(buf) ? '+' : ' '),
 		NameBuff);
+	if (len > IOSIZE - 20)
+	    len = IOSIZE - 20;
 
 	/* put "line 999" in column 40 or after the file name */
 	i = 40 - vim_strsize(IObuff);