diff --git a/adapters/oidc/js/src/main/resources/keycloak.d.ts b/adapters/oidc/js/src/main/resources/keycloak.d.ts
index 2f5d220..3033c93 100644
--- a/adapters/oidc/js/src/main/resources/keycloak.d.ts
+++ b/adapters/oidc/js/src/main/resources/keycloak.d.ts
@@ -78,7 +78,7 @@ declare namespace Keycloak {
* Set the interval to check login state (in seconds).
* @default 5
*/
- checkLoginIframeInterval?: boolean;
+ checkLoginIframeInterval?: number;
/**
* Set the OpenID Connect response mode to send to Keycloak upon login.
