diff --git a/trunk/src/service/srs_service_st.hpp b/trunk/src/service/srs_service_st.hpp
index c3f03b8a3..4bb02a5b5 100644
--- a/trunk/src/service/srs_service_st.hpp
+++ b/trunk/src/service/srs_service_st.hpp
@@ -90,6 +90,8 @@ extern srs_netfd_t srs_accept(srs_netfd_t stfd, struct sockaddr *addr, int *addr
 
 extern ssize_t srs_read(srs_netfd_t stfd, void *buf, size_t nbyte, srs_utime_t timeout);
 
+extern bool srs_is_never_timeout(srs_utime_t tm);
+
 // The mutex locker.
 #define SrsLocker(instance) \
     impl__SrsLocker _srs_auto_free_##instance(&instance)
diff --git a/trunk/src/utest/srs_utest_service.cpp b/trunk/src/utest/srs_utest_service.cpp
index 868116f92..a1b9d53ff 100644
--- a/trunk/src/utest/srs_utest_service.cpp
+++ b/trunk/src/utest/srs_utest_service.cpp
@@ -39,7 +39,7 @@ VOID TEST(ServiceTimeTest, TimeUnit)
     EXPECT_EQ(1000*1000, SRS_UTIME_SECONDS);
     EXPECT_EQ(60*1000*1000, SRS_UTIME_MINUTES);
     EXPECT_EQ(3600*1000*1000LL, SRS_UTIME_HOURS);
-    
+
     EXPECT_TRUE(srs_is_never_timeout(SRS_UTIME_NO_TIMEOUT));
     EXPECT_FALSE(srs_is_never_timeout(0));
 }