diff --git a/source/cChunk.cpp b/source/cChunk.cpp
index 9d0fc8bdf..f56584cbf 100644
--- a/source/cChunk.cpp
+++ b/source/cChunk.cpp
@@ -257,8 +257,9 @@ void cChunk::SetAllData(const char * a_BlockData, cEntityList & a_Entities, cBlo
 				m_PosX, m_PosZ
 			);
 
-			// Assert because this is a very curious case. These lines were executed once before, when a player died, re spawned, and walked around a bit. It's uncertain why an entity would be in the chunk in this case.
-			ASSERT(!"Unexpected entity in chunk!");
+			// MD 2012_03_10: This may happen if a mob is generated near the edge of loaded chunks and walks off of the edge.
+			// Older: Assert because this is a very curious case. These lines were executed once before, when a player died, re spawned, and walked around a bit. It's uncertain why an entity would be in the chunk in this case.
+			// ASSERT(!"Unexpected entity in chunk!");
 
 			(*itr)->Destroy();
 		}
diff --git a/source/packets/cPacket_SpawnMob.cpp b/source/packets/cPacket_SpawnMob.cpp
index ba0029dd3..d3f1850b3 100644
--- a/source/packets/cPacket_SpawnMob.cpp
+++ b/source/packets/cPacket_SpawnMob.cpp
@@ -26,6 +26,7 @@ cPacket_SpawnMob::cPacket_SpawnMob()
 	, m_Pitch( 0 )
 	, m_MetaDataSize( 0 )
 	, m_MetaData( 0 )
+	, m_HeadYaw(0)
 {
 	m_PacketID = E_SPAWN_MOB;
 }
@@ -40,10 +41,11 @@ cPacket_SpawnMob::cPacket_SpawnMob( const cPacket_SpawnMob & a_Clone )
 
 	m_PacketID = E_SPAWN_MOB;
 	m_UniqueID = a_Clone.m_UniqueID;
-	m_Type = a_Clone.m_Type;
-	*m_Pos = *a_Clone.m_Pos;
-	m_Yaw = a_Clone.m_Yaw;
-	m_Pitch = a_Clone.m_Pitch;
+	m_Type     = a_Clone.m_Type;
+	*m_Pos     = *a_Clone.m_Pos;
+	m_Yaw      = a_Clone.m_Yaw;
+	m_Pitch    = a_Clone.m_Pitch;
+	m_HeadYaw  = a_Clone.m_HeadYaw;
 
 	m_MetaDataSize = a_Clone.m_MetaDataSize;
 	m_MetaData = new char[m_MetaDataSize];
@@ -64,6 +66,7 @@ void cPacket_SpawnMob::Serialize(AString & a_Data) const
 	AppendInteger	(a_Data, m_Pos->z);
 	AppendByte		(a_Data, m_Yaw);
 	AppendByte		(a_Data, m_Pitch);
+	AppendByte    (a_Data, m_HeadYaw);
 	AppendData		(a_Data, m_MetaData, m_MetaDataSize);
 }
 
diff --git a/source/packets/cPacket_SpawnMob.h b/source/packets/cPacket_SpawnMob.h
index 8a1ef2264..ff579af99 100644
--- a/source/packets/cPacket_SpawnMob.h
+++ b/source/packets/cPacket_SpawnMob.h
@@ -28,8 +28,7 @@ public:
 	Vector3i* m_Pos;
 	char      m_Yaw;
 	char      m_Pitch;
-
-	static const unsigned int c_Size = 1 + 4 + 1 + 4 + 4 + 4 + 1 + 1; // + metadata
+	char      m_HeadYaw;
 
 	unsigned int m_MetaDataSize;
 	char * m_MetaData;