diff --git a/crates/handlers/src/oauth2/discovery.rs b/crates/handlers/src/oauth2/discovery.rs
index 9d8eff64..ba4b6283 100644
--- a/crates/handlers/src/oauth2/discovery.rs
+++ b/crates/handlers/src/oauth2/discovery.rs
@@ -71,7 +71,11 @@ pub(crate) async fn get(
         ResponseMode::Fragment,
     ]);
 
-    let grant_types_supported = Some(vec![GrantType::AuthorizationCode, GrantType::RefreshToken]);
+    let grant_types_supported = Some(vec![
+        GrantType::AuthorizationCode,
+        GrantType::RefreshToken,
+        GrantType::ClientCredentials,
+    ]);
 
     let token_endpoint_auth_methods_supported = client_auth_methods_supported.clone();
     let token_endpoint_auth_signing_alg_values_supported =