diff --git a/include/__debug b/include/__debug
index c7bd5d0fa..0d631bf04 100644
--- a/include/__debug
+++ b/include/__debug
@@ -16,7 +16,9 @@
 #   include <cstdlib>
 #   include <cstdio>
 #   include <cstddef>
-#   define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : (_VSTD::printf("%s\n", m), _VSTD::abort()))
+#   ifndef _LIBCPP_ASSERT
+#      define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : (_VSTD::printf("%s\n", m), _VSTD::abort()))
+#   endif
 
 #endif
 
diff --git a/test/containers/sequences/vector/db_iterators_1.pass.cpp b/test/containers/sequences/vector/db_iterators_1.pass.cpp
new file mode 100644
index 000000000..6fff0ba80
--- /dev/null
+++ b/test/containers/sequences/vector/db_iterators_1.pass.cpp
@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <vector>
+
+// iterator       begin();
+// iterator       end();
+// const_iterator begin()  const;
+// const_iterator end()    const;
+// const_iterator cbegin() const;
+// const_iterator cend()   const;
+
+#if _LIBCPP_DEBUG2 >= 1
+
+struct X {};
+
+#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::terminate())
+
+#include <vector>
+#include <cassert>
+#include <iterator>
+#include <exception>
+#include <cstdlib>
+
+void f1()
+{
+    std::exit(0);
+}
+
+int main()
+{
+    std::set_terminate(f1);
+    typedef int T;
+    typedef std::vector<T> C;
+    C c1;
+    C c2;
+    bool b = c1.begin() != c2.begin();
+    assert(false);
+}
+
+#else
+
+int main()
+{
+}
+
+#endif
\ No newline at end of file