diff --git a/tests/fortify_test.cpp b/tests/fortify_test.cpp
index 67103e1..2835f1d 100644
--- a/tests/fortify_test.cpp
+++ b/tests/fortify_test.cpp
@@ -407,11 +407,8 @@
   ASSERT_FORTIFY(sprintf(buf, "%s", source_buf));
 }
 
-#ifdef __clang__
-// Exists upstream, but hasn't been pulled in yet.
-#if __has_attribute(alloc_size)
-#error "Reenable this test"
-#endif
+#ifdef __clang__ && !__has_attribute(alloc_size)
+// TODO: remove this after Clang prebuilt rebase.
 #else
 // This test is disabled in clang because clang doesn't properly detect
 // this buffer overflow. TODO: Fix clang.