diff --git a/libcxxabi/src/private_typeinfo.cpp b/libcxxabi/src/private_typeinfo.cpp
--- a/libcxxabi/src/private_typeinfo.cpp
+++ b/libcxxabi/src/private_typeinfo.cpp
@@ -615,10 +615,27 @@
     // Possible future optimization:  Take advantage of src2dst_offset
 
     // Get (dynamic_ptr, dynamic_type) from static_ptr
-    void **vtable = *static_cast<void ** const *>(static_ptr);
-    ptrdiff_t offset_to_derived = reinterpret_cast<ptrdiff_t>(vtable[-2]);
+#if __has_feature(cxx_abi_relative_vtable)
+    // The vtable address will point to the first virtual function, which is 8
+    // bytes after the start of the vtable (4 for the offset from top + 4 for the typeinfo component).
+    uint32_t* vtable = *reinterpret_cast<uint32_t* const*>(static_ptr);
+    uint32_t offset_to_derived = vtable[-2];
     const void* dynamic_ptr = static_cast<const char*>(static_ptr) + offset_to_derived;
-    const __class_type_info* dynamic_type = static_cast<const __class_type_info*>(vtable[-1]);
+
+    // The typeinfo component is now a relative offset to a proxy.
+    int32_t offset_to_ti_proxy = static_cast<int32_t>(vtable[-1]);
+    uint8_t* ptr_to_ti_proxy =
+        reinterpret_cast<uint8_t*>(vtable) + offset_to_ti_proxy;
+    const __class_type_info* dynamic_type =
+        *(reinterpret_cast<__class_type_info**>(ptr_to_ti_proxy));
+#else
+    void** vtable = *static_cast<void** const*>(static_ptr);
+    ptrdiff_t offset_to_derived = reinterpret_cast<ptrdiff_t>(vtable[-2]);
+    const void* dynamic_ptr =
+        static_cast<const char*>(static_ptr) + offset_to_derived;
+    const __class_type_info* dynamic_type =
+        static_cast<const __class_type_info*>(vtable[-1]);
+#endif
 
     // Initialize answer to nullptr.  This will be changed from the search
     //    results if a non-null answer is found.  Regardless, this is what will