diff --git a/WHATS_NEW b/WHATS_NEW
index 75be2e7a6..39b800085 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,4 +1,5 @@
 Version 2.02.28 -
+  In _line_append, use "sizeof buf - 1" rather than equivalent "4095"
   Introduce is_same_inode macro, now including a comparison of st_dev.
   Don't leak a file descriptor in _lock_file(), when flock fails.
   Add SUN's LDOM virtual block device to filters
diff --git a/lib/config/config.c b/lib/config/config.c
index b5f003810..bbfe7dfb1 100644
--- a/lib/config/config.c
+++ b/lib/config/config.c
@@ -367,8 +367,8 @@ static int _line_append(struct output_line *outline, const char *fmt, ...)
 	int n;
 
 	va_start(ap, fmt);
-	n = vsnprintf(&buf[0], 4095, fmt, ap);
-	if (n < 0 || n > 4095) {
+	n = vsnprintf(&buf[0], sizeof buf - 1, fmt, ap);
+	if (n < 0 || n > sizeof buf - 1) {
 		log_error("vsnprintf failed for config line");
 		return 0;
 	}