diff --git a/src/runtime/runtime-test.cc b/src/runtime/runtime-test.cc
index 09432556aa..4e881ff8f5 100644
--- a/src/runtime/runtime-test.cc
+++ b/src/runtime/runtime-test.cc
@@ -629,6 +629,19 @@ RUNTIME_FUNCTION(Runtime_SetAllocationTimeout) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_AddrOf) {
+  HandleScope scope(isolate);
+  CONVERT_ARG_CHECKED(Object, o, 0);
+  return *BigInt::FromUint64(isolate, reinterpret_cast<uint64_t>(o.ptr()));
+}
+
+RUNTIME_FUNCTION(Runtime_PtrAt) {
+  HandleScope scope(isolate);
+  CONVERT_ARG_CHECKED(BigInt, bigint, 0);
+  uint64_t *addr = reinterpret_cast<uint64_t*>(bigint.AsUint64());
+  return *BigInt::FromUint64(isolate, *addr);
+}
+
 RUNTIME_FUNCTION(Runtime_DebugPrint) {
   SealHandleScope shs(isolate);
   DCHECK_EQ(1, args.length());
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 42ac1ddefd..2c98b9989b 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -441,6 +441,8 @@ namespace internal {
   F(ConstructSlicedString, 2, 1)              \
   F(ConstructDouble, 2, 1)                    \
   F(DebugPrint, 1, 1)                         \
+  F(AddrOf, 1, 1)                             \
+  F(PtrAt, 1, 1)                              \
   F(DebugTrace, 0, 1)                         \
   F(DebugTrackRetainingPath, -1, 1)           \
   F(DeoptimizeFunction, 1, 1)                 \