diff --git a/patchlevel.h b/patchlevel.h
index c6a76151..636be1cc 100644
--- a/patchlevel.h
+++ b/patchlevel.h
@@ -25,6 +25,6 @@
    regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
    looks for to find the patch level (for the sccs version string). */
 
-#define PATCHLEVEL 12
+#define PATCHLEVEL 13
 
 #endif /* _PATCHLEVEL_H_ */
diff --git a/subst.c b/subst.c
index b23610ee..df25f632 100644
--- a/subst.c
+++ b/subst.c
@@ -3706,7 +3706,10 @@ remove_quoted_nulls (string)
 	    break;
 	}
       else if (string[i] == CTLNUL)
-	i++;
+	{
+	  i++;
+	  continue;
+	}
 
       prev_i = i;
       ADVANCE_CHAR (string, slen, i);