diff --git a/ext/v8/heap.cc b/ext/v8/heap.cc
index d8574dd..cf930b6 100644
--- a/ext/v8/heap.cc
+++ b/ext/v8/heap.cc
@@ -6,6 +6,7 @@ namespace rr {
       defineSingletonMethod("new", &initialize).
       defineMethod("total_heap_size", &total_heap_size).
       defineMethod("total_heap_size_executable", &total_heap_size_executable).
+      defineMethod("total_physical_size", &total_physical_size).
       defineMethod("used_heap_size", &used_heap_size).
       defineMethod("heap_size_limit", &heap_size_limit).
       store(&Class);
@@ -19,6 +20,9 @@ namespace rr {
   VALUE HeapStatistics::total_heap_size_executable(VALUE self) {
     return SIZET2NUM(HeapStatistics(self)->total_heap_size_executable());
   }
+  VALUE HeapStatistics::total_physical_size(VALUE self) {
+    return SIZET2NUM(HeapStatistics(self)->total_physical_size());
+  }
   VALUE HeapStatistics::used_heap_size(VALUE self) {
     return SIZET2NUM(HeapStatistics(self)->used_heap_size());
   }
@@ -28,4 +32,4 @@ namespace rr {
   template <> void Pointer<v8::HeapStatistics>::unwrap(VALUE value) {
     Data_Get_Struct(value, class v8::HeapStatistics, pointer);
   }
-}
\ No newline at end of file
+}
diff --git a/ext/v8/rr.h b/ext/v8/rr.h
index 4d93dbd..5e001cf 100644
--- a/ext/v8/rr.h
+++ b/ext/v8/rr.h
@@ -819,6 +819,7 @@ public:
   static VALUE initialize(VALUE self);
   static VALUE total_heap_size(VALUE self);
   static VALUE total_heap_size_executable(VALUE self);
+  static VALUE total_physical_size(VALUE self);
   static VALUE used_heap_size(VALUE self);
   static VALUE heap_size_limit(VALUE self);