diff --git a/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp b/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
--- a/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
+++ b/libcxx/test/std/input.output/iostreams.base/ios.base/ios.members.static/sync_with_stdio.pass.cpp
@@ -20,11 +20,11 @@
     assert( std::ios_base::sync_with_stdio(false));
     assert(!std::ios_base::sync_with_stdio(false));
     assert(!std::ios_base::sync_with_stdio(true));
-    assert( std::ios_base::sync_with_stdio(true));
-    assert( std::ios_base::sync_with_stdio());
-    assert( std::ios_base::sync_with_stdio(false));
-    assert(!std::ios_base::sync_with_stdio());
-    assert( std::ios_base::sync_with_stdio());
+    LIBCPP_ASSERT( std::ios_base::sync_with_stdio(true));
+    LIBCPP_ASSERT( std::ios_base::sync_with_stdio());
+    LIBCPP_ASSERT( std::ios_base::sync_with_stdio(false));
+    LIBCPP_ASSERT(!std::ios_base::sync_with_stdio());
+    LIBCPP_ASSERT( std::ios_base::sync_with_stdio());
 
   return 0;
 }