diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca87923..f25d460 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixes
+
+(countdown) Reset `Mission Elapsed Time (MET)` if `countdown` is set by cli arguments [#71](https://github.com/sectore/timr-tui/pull/71)
+
 ### Misc.
 
 (cargo) Exclude files for packaging [e7a5a1b](https://github.com/sectore/timr-tui/commit/e7a5a1b2da7a7967f2602a0b92f391ac768ca638)
diff --git a/src/app.rs b/src/app.rs
index 1f02d59..b1f9141 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -103,7 +103,11 @@ impl From<FromAppArgs> for App {
             initial_value_countdown: args.countdown.unwrap_or(stg.inital_value_countdown),
             // invalidate `current_value_countdown` if an initial value is set via args
             current_value_countdown: args.countdown.unwrap_or(stg.current_value_countdown),
-            elapsed_value_countdown: stg.elapsed_value_countdown,
+            elapsed_value_countdown: match args.countdown {
+                // reset value if countdown is set by arguments
+                Some(_) => Duration::ZERO,
+                None => stg.elapsed_value_countdown,
+            },
             current_value_timer: stg.current_value_timer,
             app_tx,
             #[cfg(feature = "sound")]