diff --git a/tests/stdlib_test.cpp b/tests/stdlib_test.cpp
index ed5767c..1a3fc03 100644
--- a/tests/stdlib_test.cpp
+++ b/tests/stdlib_test.cpp
@@ -325,16 +325,12 @@
 
 TEST(stdlib, mkostemp64) {
   TemporaryFile tf([](char* path) { return mkostemp64(path, O_CLOEXEC); });
-  int flags = fcntl(tf.fd, F_GETFD);
-  ASSERT_TRUE(flags != -1);
-  ASSERT_EQ(FD_CLOEXEC, flags & FD_CLOEXEC);
+  AssertCloseOnExec(tf.fd, true);
 }
 
 TEST(stdlib, mkostemp) {
   TemporaryFile tf([](char* path) { return mkostemp(path, O_CLOEXEC); });
-  int flags = fcntl(tf.fd, F_GETFD);
-  ASSERT_TRUE(flags != -1);
-  ASSERT_EQ(FD_CLOEXEC, flags & FD_CLOEXEC);
+  AssertCloseOnExec(tf.fd, true);
 }
 
 TEST(stdlib, mkstemp64) {