diff --git a/crates/zed/src/main.rs b/crates/zed/src/main.rs
index 8531525891..54691f2254 100644
--- a/crates/zed/src/main.rs
+++ b/crates/zed/src/main.rs
@@ -449,7 +449,7 @@ async fn watch_themes(
     mut cx: AsyncAppContext,
 ) -> Option<()> {
     let mut events = fs
-        .watch("styles/src".as_ref(), Duration::from_millis(250))
+        .watch("styles/src".as_ref(), Duration::from_millis(100))
         .await;
     while let Some(_) = events.next().await {
         let output = Command::new("npm")
diff --git a/styles/src/buildThemes.ts b/styles/src/buildThemes.ts
index dad56046a9..c43be067a8 100644
--- a/styles/src/buildThemes.ts
+++ b/styles/src/buildThemes.ts
@@ -11,7 +11,10 @@ const tempDirectory = fs.mkdtempSync(path.join(tmpdir(), 'build-themes'));
 // Clear existing themes
 for (const file of fs.readdirSync(themeDirectory)) {
   if (file.endsWith('.json')) {
-    fs.unlinkSync(path.join(themeDirectory, file));
+    const name = file.replace(/\.json$/, '');
+    if (!themes.find(theme => theme.name === name)) {
+      fs.unlinkSync(path.join(themeDirectory, file));
+    }
   }
 }