diff --git a/ext/v8/convert_ruby.h b/ext/v8/convert_ruby.h
index 594263a..a7418cc 100644
--- a/ext/v8/convert_ruby.h
+++ b/ext/v8/convert_ruby.h
@@ -54,7 +54,7 @@ template<class DEST, class RET> class RubyValueSource {
     
 private:
     RET convertString(VALUE& value) {
-        std::string stringValue(RSTRING(value)->ptr);
+        std::string stringValue(RSTRING_PTR(value));
         return dest.pushString(stringValue);
     }
 };
diff --git a/ext/v8/v8_str.cpp b/ext/v8/v8_str.cpp
index 2f1b554..faf5d14 100644
--- a/ext/v8/v8_str.cpp
+++ b/ext/v8/v8_str.cpp
@@ -7,7 +7,7 @@ using namespace v8;
 
 VALUE v8_str_new(VALUE clazz, VALUE str) {
   HandleScope handles;
-  return V8_Ref_Create(clazz, String::New(RSTRING(str)->ptr));
+  return V8_Ref_Create(clazz, String::New(RSTRING_PTR(str)));
 }
 
 VALUE v8_str_to_s(VALUE self){
diff --git a/ext/v8/v8_template.cpp b/ext/v8/v8_template.cpp
index 3ef286d..96bb04c 100644
--- a/ext/v8/v8_template.cpp
+++ b/ext/v8/v8_template.cpp
@@ -28,7 +28,7 @@ VALUE v8_Template_Set(VALUE self, VALUE name, VALUE value) {
   HandleScope handles;
   Local<Template> tmpl = V8_Ref_Get<Template>(self);
   Local<Data> data = V8_Ref_Get<Data>(value);
-  tmpl->Set(RSTRING(name)->ptr, data);
+  tmpl->Set(RSTRING_PTR(name), data);
   return Qnil;
 }