diff --git a/src/ops.c b/src/ops.c
index 845211d..2c054d9 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -6458,7 +6458,7 @@
     long	chars = 0;
     int		is_word = 0;
 
-    for (i = 0; line[i] && i < limit; )
+    for (i = 0; i < limit && line[i] != NUL; )
     {
 	if (is_word)
 	{
diff --git a/src/version.c b/src/version.c
index d424af7..ebe1988 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    573,
+/**/
     572,
 /**/
     571,