diff --git a/libethereum/ExtVM.h b/libethereum/ExtVM.h
index 737e003dd..7709f9d7f 100644
--- a/libethereum/ExtVM.h
+++ b/libethereum/ExtVM.h
@@ -62,12 +62,12 @@ public:
 		return ret;
 	}
 
-	/// Create a new message call.
-	bool call(Address _receiveAddress, u256 _txValue, bytesConstRef _txData, u256* _gas, bytesRef _out, OnOpFunc const& _onOp = OnOpFunc())
+	/// Create a new message call. Leave _myAddressOverride at he default to use the present address as caller.
+	bool call(Address _receiveAddress, u256 _txValue, bytesConstRef _txData, u256* _gas, bytesRef _out, OnOpFunc const& _onOp = OnOpFunc(), Address _myAddressOverride = Address())
 	{
 		if (m_ms)
 			m_ms->internal.resize(m_ms->internal.size() + 1);
-		auto ret = m_s.call(_receiveAddress, myAddress, _txValue, gasPrice, _txData, _gas, _out, origin, &suicides, &posts, m_ms ? &(m_ms->internal.back()) : nullptr, _onOp, level + 1);
+		auto ret = m_s.call(_receiveAddress, _myAddressOverride ? _myAddressOverride : myAddress, _txValue, gasPrice, _txData, _gas, _out, origin, &suicides, &posts, m_ms ? &(m_ms->internal.back()) : nullptr, _onOp, level + 1);
 		if (m_ms && !m_ms->internal.back().from)
 			m_ms->internal.pop_back();
 		return ret;
@@ -100,7 +100,7 @@ public:
 		while (posts.size())
 		{
 			Post& p = posts.front();
-			call(p.to, p.value, &p.data, &p.gas, bytesRef(), _onOp);
+			call(p.to, p.value, &p.data, &p.gas, bytesRef(), _onOp, p.from);
 			ret += p.gas;
 			posts.pop_front();
 		}
diff --git a/libevm/ExtVMFace.h b/libevm/ExtVMFace.h
index 3fe7bea5a..7aa8df8e5 100644
--- a/libevm/ExtVMFace.h
+++ b/libevm/ExtVMFace.h
@@ -31,6 +31,7 @@ namespace eth
 
 struct Post
 {
+	Address from;
 	Address to;
 	u256 value;
 	bytes data;
@@ -79,7 +80,7 @@ public:
 	bool call(Address, u256, bytesConstRef, u256*, bytesRef) { return false; }
 
 	/// Post a new message call.
-	void post(Address _to, u256 _value, bytesConstRef _data, u256 _gas) { posts.push_back(Post({_to, _value, _data.toBytes(), _gas})); }
+	void post(Address _to, u256 _value, bytesConstRef _data, u256 _gas) { posts.push_back(Post({myAddress, _to, _value, _data.toBytes(), _gas})); }
 
 	/// Revert any changes made (by any of the other calls).
 	void revert() {}