diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d6ecd97e..611e973e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 ## v1.7 [unreleased]
 ### Features
 
-- [#3964](https://github.com/influxdata/telegraf/pull/3964): Add repl_oplog_window_s metric to mongodb input.
+- [#3964](https://github.com/influxdata/telegraf/pull/3964): Add repl_oplog_window_sec metric to mongodb input.
 
 ## v1.6 [unreleased]