diff --git a/src/main/java/com/yunhai/userbase/config/CasSsoConfiguration.java b/src/main/java/com/yunhai/userbase/config/CasSsoConfiguration.java
index 9310b8a..efcc806 100644
--- a/src/main/java/com/yunhai/userbase/config/CasSsoConfiguration.java
+++ b/src/main/java/com/yunhai/userbase/config/CasSsoConfiguration.java
@@ -48,6 +48,8 @@ public class CasSsoConfiguration {
     public FilterRegistrationBean<SingleSignOutFilter> casSingleSignOutFilter() {
         FilterRegistrationBean<SingleSignOutFilter> bean = new FilterRegistrationBean<>();
         bean.setFilter(new SingleSignOutFilter());
+        // 单点登出过滤器需经 init-parameter 注入 CAS 服务端地址（与校验过滤器一致）
+        bean.addInitParameter("casServerUrlPrefix", ssoProperties.getServerUrlPrefix());
         bean.addUrlPatterns("/api/*");
         bean.setOrder(Ordered.HIGHEST_PRECEDENCE + 5);
         return bean;