diff --git a/src/main.rs b/src/main.rs
index 8c717af..7c996a8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -464,15 +464,13 @@ fn init_logger() {
 fn validate_freq(freq_mhz: u32, label: &str) -> Result<(), AppError> {
     if freq_mhz == 0 {
         error!("{label} frequency cannot be zero");
-        let err = ControlError::InvalidValueError(format!("{label} frequency cannot be zero"));
-        Err(err.into())
+        Err(AppError::Generic(format!("{label} frequency cannot be zero")))
     } else if freq_mhz > 10000 {
         // Extremely high value unlikely to be valid
         error!("{label} frequency ({freq_mhz} MHz) is unreasonably high");
-        let err = ControlError::InvalidValueError(format!(
+        Err(AppError::Generic(format!(
             "{label} frequency ({freq_mhz} MHz) is unreasonably high"
-        ));
-        Err(err.into())
+        )))
     } else {
         Ok(())
     }