diff --git a/test/test-fs.c b/test/test-fs.c
index dcc39765..d0f05526 100644
--- a/test/test-fs.c
+++ b/test/test-fs.c
@@ -951,7 +951,10 @@ TEST_IMPL(fs_fstat) {
   ASSERT(s->st_birthtim.tv_nsec == t.st_birthtimespec.tv_nsec);
   ASSERT(s->st_flags == t.st_flags);
   ASSERT(s->st_gen == t.st_gen);
-#elif defined(_BSD_SOURCE) || defined(_SVID_SOURCE) || defined(_XOPEN_SOURCE)
+#elif defined(__sun) || \
+      defined(_BSD_SOURCE) || \
+      defined(_SVID_SOURCE) || \
+      defined(_XOPEN_SOURCE)
   ASSERT(s->st_atim.tv_sec == t.st_atim.tv_sec);
   ASSERT(s->st_atim.tv_nsec == t.st_atim.tv_nsec);
   ASSERT(s->st_mtim.tv_sec == t.st_mtim.tv_sec);