diff --git a/src/cxa_new_delete.cpp b/src/cxa_new_delete.cpp
index f6db1aa..25a5454 100644
--- a/src/cxa_new_delete.cpp
+++ b/src/cxa_new_delete.cpp
@@ -232,6 +232,19 @@
 
 // bad_array_length
 
+#ifndef _LIBCPP_BAD_ARRAY_LENGTH_DEFINED
+
+class _LIBCPP_EXCEPTION_ABI bad_array_length
+    : public bad_alloc
+{
+public:
+    bad_array_length() _NOEXCEPT;
+    virtual ~bad_array_length() _NOEXCEPT;
+    virtual const char* what() const _NOEXCEPT;
+};
+
+#endif  // _LIBCPP_BAD_ARRAY_LENGTH_DEFINED
+
 bad_array_length::bad_array_length() _NOEXCEPT
 {
 }