diff --git a/src/commands/month.rs b/src/commands/month.rs
index 9743e5c..2f1ec0d 100644
--- a/src/commands/month.rs
+++ b/src/commands/month.rs
@@ -29,18 +29,14 @@ fn beginning_of_previous_month(time: DateTime<Local>) -> DateTime<Utc> {
     }
 }
 
+#[derive(Default)]
 enum MonthSpec {
     Last,
+    #[default]
     This,
     Month(u32),
 }
 
-impl Default for MonthSpec {
-    fn default() -> MonthSpec {
-        MonthSpec::This
-    }
-}
-
 impl FromStr for MonthSpec {
     type Err = Error;
 
diff --git a/src/commands/resume.rs b/src/commands/resume.rs
index 3ba9426..4f530e1 100644
--- a/src/commands/resume.rs
+++ b/src/commands/resume.rs
@@ -12,18 +12,14 @@ use crate::io::Streams;
 use crate::interactive::note_from_last_entries;
 use super::{Command, Facts, r#in, sheet};
 
+#[derive(Default)]
 enum SelectedEntry {
     Id(u64),
     Interactive,
+    #[default]
     NotSpecified,
 }
 
-impl Default for SelectedEntry {
-    fn default() -> Self {
-        SelectedEntry::NotSpecified
-    }
-}
-
 #[derive(Default)]
 pub struct Args {
     entry: SelectedEntry,
diff --git a/src/formatters.rs b/src/formatters.rs
index a88a0d8..6617658 100644
--- a/src/formatters.rs
+++ b/src/formatters.rs
@@ -15,9 +15,10 @@ pub mod ical;
 pub mod custom;
 pub mod chart;
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
 #[serde(rename_all = "lowercase")]
 pub enum Formatter {
+    #[default]
     Text,
     Csv,
     Json,
@@ -27,12 +28,6 @@ pub enum Formatter {
     Custom(String),
 }
 
-impl Default for Formatter {
-    fn default() -> Formatter {
-        Formatter::Text
-    }
-}
-
 impl Formatter {
     /// Prints the given entries to the specified output device.
     ///