diff --git a/README.md b/README.md
index c4a54b6..e409173 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,14 @@ class V8Js
     public function setMemoryLimit($limit)
     {}
 
+    /**
+     * Set the average object size (in bytes) for this V8Js object.
+     * V8's "amount of external memory" is adjusted by this value for every exported object.  V8 triggers a garbage collection once this totals to 192 MB.
+     * @param int $average_object_size
+     */
+    public function setAverageObjectSize($average_object_size)
+    {}
+
     /**
      * Returns uncaught pending exception or null if there is no pending exception.
      * @return V8JsScriptException|null
diff --git a/tests/set_average_object_size_basic.phpt b/tests/set_average_object_size_basic.phpt
new file mode 100644
index 0000000..8247ef1
--- /dev/null
+++ b/tests/set_average_object_size_basic.phpt
@@ -0,0 +1,16 @@
+--TEST--
+Test V8::setAverageObjectSize() : Average object size can be set on V8Js object
+--SKIPIF--
+<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+--FILE--
+<?php
+$v8 = new V8Js();
+$v8->setAverageObjectSize(32768);
+
+// there's no API to query the currently announced external memory allocation,
+// hence not much we can do here...
+
+?>
+===EOF===
+--EXPECT--
+===EOF===
diff --git a/v8js_class.cc b/v8js_class.cc
index f10725f..65c4993 100644
--- a/v8js_class.cc
+++ b/v8js_class.cc
@@ -158,7 +158,7 @@ static void v8js_free_storage(void *object TSRMLS_DC) /* {{{ */
 		 it != c->weak_objects.end(); ++it) {
 		zval *value = it->first;
 		zval_ptr_dtor(&value);
-		c->isolate->AdjustAmountOfExternalAllocatedMemory(-1024);
+		c->isolate->AdjustAmountOfExternalAllocatedMemory(-c->average_object_size);
 		it->second.Reset();
 	}
 	c->weak_objects.~map();
@@ -254,6 +254,8 @@ static zend_object_value v8js_new(zend_class_entry *ce TSRMLS_DC) /* {{{ */
 	new(&c->v8js_v8objects) std::list<v8js_v8object *>();
 	new(&c->script_objects) std::vector<v8js_script *>();
 
+	c->average_object_size = 1024;
+
 	retval.handle = zend_objects_store_put(c, NULL, (zend_objects_free_object_storage_t) v8js_free_storage, NULL TSRMLS_CC);
 	retval.handlers = &v8js_object_handlers;
 
@@ -899,6 +901,22 @@ static PHP_METHOD(V8Js, setMemoryLimit)
 }
 /* }}} */
 
+/* {{{ proto void V8Js::setAverageObjectSize(average_object_size)
+ */
+static PHP_METHOD(V8Js, setAverageObjectSize)
+{
+	v8js_ctx *c;
+	long average_object_size = 0;
+
+	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &average_object_size) == FAILURE) {
+		return;
+	}
+
+	c = (v8js_ctx *) zend_object_store_get_object(getThis() TSRMLS_CC);
+	c->average_object_size = average_object_size;
+}
+/* }}} */
+
 static void v8js_persistent_zval_ctor(zval **p) /* {{{ */
 {
 	zval *orig_ptr = *p;
@@ -1178,6 +1196,10 @@ ZEND_BEGIN_ARG_INFO_EX(arginfo_v8js_setmoduleloader, 0, 0, 1)
 	ZEND_ARG_INFO(0, callable)
 ZEND_END_ARG_INFO()
 
+ZEND_BEGIN_ARG_INFO_EX(arginfo_v8js_setaverageobjectsize, 0, 0, 1)
+	ZEND_ARG_INFO(0, average_object_size)
+ZEND_END_ARG_INFO()
+
 ZEND_BEGIN_ARG_INFO_EX(arginfo_v8js_registerextension, 0, 0, 2)
 	ZEND_ARG_INFO(0, extension_name)
 	ZEND_ARG_INFO(0, script)
@@ -1217,6 +1239,7 @@ const zend_function_entry v8js_methods[] = { /* {{{ */
 	PHP_ME(V8Js,	setModuleLoader,		arginfo_v8js_setmoduleloader,		ZEND_ACC_PUBLIC)
 	PHP_ME(V8Js,	setTimeLimit,			arginfo_v8js_settimelimit,			ZEND_ACC_PUBLIC)
 	PHP_ME(V8Js,	setMemoryLimit,			arginfo_v8js_setmemorylimit,		ZEND_ACC_PUBLIC)
+	PHP_ME(V8Js,	setAverageObjectSize,	arginfo_v8js_setaverageobjectsize,	ZEND_ACC_PUBLIC)
 	PHP_ME(V8Js,	registerExtension,		arginfo_v8js_registerextension,		ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
 	PHP_ME(V8Js,	getExtensions,			arginfo_v8js_getextensions,			ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
 
diff --git a/v8js_class.h b/v8js_class.h
index 0e91243..f4edeb5 100644
--- a/v8js_class.h
+++ b/v8js_class.h
@@ -47,6 +47,7 @@ struct v8js_ctx {
   bool time_limit_hit;
   long memory_limit;
   bool memory_limit_hit;
+  long average_object_size;
 
   v8js_tmpl_t global_template;
   v8js_tmpl_t array_tmpl;
diff --git a/v8js_object_export.cc b/v8js_object_export.cc
index 949888f..9562178 100644
--- a/v8js_object_export.cc
+++ b/v8js_object_export.cc
@@ -259,7 +259,7 @@ static void v8js_construct_callback(const v8::FunctionCallbackInfo<v8::Value>& i
 
 	// Just tell v8 that we're allocating some external memory
 	// (for the moment we just always tell 1k instead of trying to find out actual values)
-	isolate->AdjustAmountOfExternalAllocatedMemory(1024);
+	isolate->AdjustAmountOfExternalAllocatedMemory(ctx->average_object_size);
 }
 /* }}} */
 
@@ -275,7 +275,7 @@ static void v8js_weak_object_callback(const v8::WeakCallbackData<v8::Object, zva
 	ctx->weak_objects.at(value).Reset();
 	ctx->weak_objects.erase(value);
 
-	isolate->AdjustAmountOfExternalAllocatedMemory(-1024);
+	isolate->AdjustAmountOfExternalAllocatedMemory(-ctx->average_object_size);
 }
 
 static void v8js_weak_closure_callback(const v8::WeakCallbackData<v8::Object, v8js_tmpl_t> &data) {