diff --git a/src/state.rs b/src/state.rs
index 66f99972..b59a5a90 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -202,8 +202,8 @@ impl AppState {
                     self.refresh_tab();
                 }
                 KeyCode::Char('/') => self.enter_search(),
-                KeyCode::Char('t') => self.theme = self.theme.next(),
-                KeyCode::Char('T') => self.theme = self.theme.prev(),
+                KeyCode::Char('t') => self.theme.next(),
+                KeyCode::Char('T') => self.theme.prev(),
                 _ => {}
             },
             Focus::List if key.kind != KeyEventKind::Release => match key.code {
@@ -220,8 +220,8 @@ impl AppState {
                 }
                 KeyCode::Char('/') => self.enter_search(),
                 KeyCode::Tab => self.focus = Focus::TabList,
-                KeyCode::Char('t') => self.theme = self.theme.next(),
-                KeyCode::Char('T') => self.theme = self.theme.prev(),
+                KeyCode::Char('t') => self.theme.next(),
+                KeyCode::Char('T') => self.theme.prev(),
                 _ => {}
             },
             _ => {}
diff --git a/src/theme.rs b/src/theme.rs
index bb5b6af2..84fa15b4 100644
--- a/src/theme.rs
+++ b/src/theme.rs
@@ -86,17 +86,15 @@ impl Theme {
 }
 
 impl Theme {
-    #[allow(unused)]
-    pub fn next(self) -> Self {
-        let position = self as usize;
+    pub fn next(&mut self) {
+        let position = *self as usize;
         let types = Theme::value_variants();
-        types[(position + 1) % types.len()].into()
+        *self = types[(position + 1) % types.len()];
     }
 
-    #[allow(unused)]
-    pub fn prev(self) -> Self {
-        let position = self as usize;
+    pub fn prev(&mut self) {
+        let position = *self as usize;
         let types = Theme::value_variants();
-        types[(position + types.len() - 1) % types.len()].into()
+        *self = types[(position + types.len() - 1) % types.len()];
     }
 }