diff --git a/src/highlighting/theme_set.rs b/src/highlighting/theme_set.rs
index 83eeba09..4d5c7711 100644
--- a/src/highlighting/theme_set.rs
+++ b/src/highlighting/theme_set.rs
@@ -6,7 +6,7 @@ use serde_derive::{Deserialize, Serialize};
 use std::collections::BTreeMap;
 use std::path::{Path, PathBuf};
 
-#[derive(Debug, Default, Serialize, Deserialize)]
+#[derive(Clone, Debug, Default, Serialize, Deserialize)]
 pub struct ThemeSet {
     // This is a `BTreeMap` because they're faster than hashmaps on small sets
     pub themes: BTreeMap<String, Theme>,
diff --git a/tests/public-api.txt b/tests/public-api.txt
index 3a40ce23..5a2a8d06 100644
--- a/tests/public-api.txt
+++ b/tests/public-api.txt
@@ -491,6 +491,8 @@ pub fn syntect::highlighting::ThemeSet::load_from_reader<R: std::io::BufRead + s
 pub fn syntect::highlighting::ThemeSet::new() -> syntect::highlighting::ThemeSet
 impl syntect::highlighting::ThemeSet
 pub fn syntect::highlighting::ThemeSet::load_defaults() -> syntect::highlighting::ThemeSet
+impl core::clone::Clone for syntect::highlighting::ThemeSet
+pub fn syntect::highlighting::ThemeSet::clone(&self) -> syntect::highlighting::ThemeSet
 impl core::default::Default for syntect::highlighting::ThemeSet
 pub fn syntect::highlighting::ThemeSet::default() -> syntect::highlighting::ThemeSet
 impl core::fmt::Debug for syntect::highlighting::ThemeSet