diff --git a/crates/extension/src/extension_manifest.rs b/crates/extension/src/extension_manifest.rs
index 4ba3cbec2fed873930693a58bcee273355241813..bbdf7283cb0397b32c95c481350cc47827e8acc6 100644
--- a/crates/extension/src/extension_manifest.rs
+++ b/crates/extension/src/extension_manifest.rs
@@ -342,7 +342,6 @@ pub struct LanguageModelAuthConfig {
 #[derive(Clone, PartialEq, Eq, Debug, Deserialize, Serialize)]
 pub struct OAuthConfig {
     /// The text to display on the sign-in button (e.g., "Sign in with GitHub").
-    #[serde(default)]
     pub sign_in_button_label: Option<String>,
     /// The icon to display on the sign-in button (e.g., "github").
     #[serde(default)]