diff --git a/src/config.rs b/src/config.rs
index 3aff2f4..1287cde 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -30,7 +30,6 @@ pub struct Config {
     pub max_rate: i64,
     pub duty_cycle_too_high: f64,
     pub duty_cycle_too_low: f64,
-    pub optional_string: Option<String>,
 }
 
 impl Default for Config {
@@ -53,7 +52,6 @@ impl Default for Config {
             max_rate: 10,
             duty_cycle_too_high: 0.9,
             duty_cycle_too_low: 0.7,
-            optional_string: None,
         }
     }
 }