diff --git a/trunk/src/kernel/srs_kernel_mp4.hpp b/trunk/src/kernel/srs_kernel_mp4.hpp
index 6a3e58966..db43df771 100644
--- a/trunk/src/kernel/srs_kernel_mp4.hpp
+++ b/trunk/src/kernel/srs_kernel_mp4.hpp
@@ -866,6 +866,7 @@ public:
 
 // 8.6.6 Edit List Box
 // ISO_IEC_14496-12-base-format-2012.pdf, page 55
+// LCOV_EXCL_LINE
 class SrsMp4ElstEntry
 {
 public:
@@ -1564,6 +1565,7 @@ public:
 
 // 8.6.1.3 Composition Time to Sample Box (ctts), for Video.
 // ISO_IEC_14496-12-base-format-2012.pdf, page 49
+// LCOV_EXCL_LINE
 class SrsMp4CttsEntry
 {
 public:
diff --git a/trunk/src/utest/srs_utest_kernel.cpp b/trunk/src/utest/srs_utest_kernel.cpp
index 3a994d064..47908ddae 100644
--- a/trunk/src/utest/srs_utest_kernel.cpp
+++ b/trunk/src/utest/srs_utest_kernel.cpp
@@ -2721,6 +2721,12 @@ VOID TEST(KernelErrorTest, CoverAll)
         EXPECT_TRUE(srs_is_client_gracefully_close(err));
         srs_freep(err);
     }
+
+    if (true) {
+        srs_error_t err = srs_error_new(ERROR_HTTP_STREAM_EOF, "graceful close error");
+        EXPECT_TRUE(srs_is_server_gracefully_close(err));
+        srs_freep(err);
+    }
     
     if (true) {
         srs_error_t err = srs_error_wrap(srs_error_new(ERROR_CONTROL_RTMP_CLOSE, "control error"), "wrapped");