diff --git a/tests/unistd_test.cpp b/tests/unistd_test.cpp
index 7d1e612..6e495fc 100644
--- a/tests/unistd_test.cpp
+++ b/tests/unistd_test.cpp
@@ -183,7 +183,7 @@
   ASSERT_EQ(123, sb.st_size);
 }
 
-TEST(UNISTD_TEST, truncate64) {
+TEST(UNISTD_TEST, truncate64_smoke) {
   TemporaryFile tf;
   ASSERT_EQ(0, close(tf.fd));
   ASSERT_EQ(0, truncate64(tf.path, 123));
@@ -203,7 +203,7 @@
   ASSERT_EQ(123, sb.st_size);
 }
 
-TEST(UNISTD_TEST, ftruncate64) {
+TEST(UNISTD_TEST, ftruncate64_smoke) {
   TemporaryFile tf;
   ASSERT_EQ(0, ftruncate64(tf.fd, 123));
   ASSERT_EQ(0, close(tf.fd));
@@ -739,7 +739,7 @@
   // Does uname(2) agree?
   utsname buf;
   ASSERT_EQ(0, uname(&buf));
-  ASSERT_EQ(0, strncmp(hostname, buf.nodename, SYS_NMLN));
+  ASSERT_EQ(0, strncmp(hostname, buf.nodename, sizeof(buf.nodename)));
   ASSERT_GT(strlen(hostname), 0U);
 
   // Do we correctly detect truncation?
@@ -852,7 +852,9 @@
   EXPECT_EQ(_POSIX_VERSION, _POSIX_MONOTONIC_CLOCK);
 #endif
   EXPECT_GT(_POSIX_NO_TRUNC, 0);
+#if !defined(MUSL)
   EXPECT_EQ(_POSIX_VERSION, _POSIX_PRIORITY_SCHEDULING);
+#endif
   EXPECT_EQ(_POSIX_VERSION, _POSIX_RAW_SOCKETS);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_READER_WRITER_LOCKS);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_REALTIME_SIGNALS);
@@ -861,8 +863,10 @@
   EXPECT_EQ(_POSIX_VERSION, _POSIX_SEMAPHORES);
   EXPECT_GT(_POSIX_SHELL, 0);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_SPAWN);
+#if !defined(MUSL)
   EXPECT_EQ(-1, _POSIX_SPORADIC_SERVER);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_SYNCHRONIZED_IO);
+#endif
   EXPECT_EQ(_POSIX_VERSION, _POSIX_THREADS);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_THREAD_ATTR_STACKADDR);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_THREAD_ATTR_STACKSIZE);
@@ -871,27 +875,37 @@
 #endif
   EXPECT_EQ(_POSIX_VERSION, _POSIX_THREAD_PRIORITY_SCHEDULING);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_THREAD_PROCESS_SHARED);
+#if !defined(MUSL)
   EXPECT_EQ(-1, _POSIX_THREAD_ROBUST_PRIO_PROTECT);
+#endif
   EXPECT_EQ(_POSIX_VERSION, _POSIX_THREAD_SAFE_FUNCTIONS);
+#if !defined(MUSL)
   EXPECT_EQ(-1, _POSIX_THREAD_SPORADIC_SERVER);
+#endif
   EXPECT_EQ(_POSIX_VERSION, _POSIX_TIMEOUTS);
   EXPECT_EQ(_POSIX_VERSION, _POSIX_TIMERS);
+#if !defined(MUSL)
   EXPECT_EQ(-1, _POSIX_TRACE);
   EXPECT_EQ(-1, _POSIX_TRACE_EVENT_FILTER);
   EXPECT_EQ(-1, _POSIX_TRACE_INHERIT);
   EXPECT_EQ(-1, _POSIX_TRACE_LOG);
   EXPECT_EQ(-1, _POSIX_TYPED_MEMORY_OBJECTS);
+#endif
   EXPECT_NE(-1, _POSIX_VDISABLE);
 
   EXPECT_EQ(_POSIX_VERSION, _POSIX2_VERSION);
   EXPECT_EQ(_POSIX_VERSION, _POSIX2_C_BIND);
+#if !defined(MUSL)
   EXPECT_EQ(_POSIX_VERSION, _POSIX2_CHAR_TERM);
+#endif
 
   EXPECT_EQ(700, _XOPEN_VERSION);
   EXPECT_EQ(1, _XOPEN_ENH_I18N);
+#if !defined(MUSL)
   EXPECT_EQ(1, _XOPEN_REALTIME);
   EXPECT_EQ(1, _XOPEN_REALTIME_THREADS);
   EXPECT_EQ(1, _XOPEN_SHM);
+#endif
   EXPECT_EQ(1, _XOPEN_UNIX);
 
 #if defined(__BIONIC__)