diff --git a/src/Chunk.h b/src/Chunk.h
index b525fbb82..bc66b6528 100644
--- a/src/Chunk.h
+++ b/src/Chunk.h
@@ -421,6 +421,7 @@ public:
 	cSandSimulatorChunkData & GetSandSimulatorData (void) { return m_SandSimulatorData; }
 
 	cRedstoneSimulatorChunkData * GetRedstoneSimulatorData(void) { return m_RedstoneSimulatorData; }
+	void SetRedstoneSimulatorData(cRedstoneSimulatorChunkData * a_Data) { m_RedstoneSimulatorData = a_Data; }
 	bool IsRedstoneDirty(void) const { return m_IsRedstoneDirty; }
 	void SetIsRedstoneDirty(bool a_Flag) { m_IsRedstoneDirty = a_Flag; }
 
diff --git a/src/Simulator/IncrementalRedstoneSimulator.inc b/src/Simulator/IncrementalRedstoneSimulator.inc
index 6fda9824c..adaa47967 100644
--- a/src/Simulator/IncrementalRedstoneSimulator.inc
+++ b/src/Simulator/IncrementalRedstoneSimulator.inc
@@ -77,7 +77,7 @@ private:
 	};
 	
 	class cIncrementalRedstoneSimulatorChunkData :
-	cRedstoneSimulatorChunkData
+	public cRedstoneSimulatorChunkData
 	{
 	public:
 		/// Per-chunk data for the simulator, specified individual chunks to simulate
@@ -554,6 +554,11 @@ template <class ChunkType, class WorldType, template <BLOCKTYPE block> class Get
 void cIncrementalRedstoneSimulator<ChunkType, WorldType, GetHandlerCompileTime, ChestType>::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, ChunkType * a_Chunk)
 {
 	m_RedstoneSimulatorChunkData = (cIncrementalRedstoneSimulator<ChunkType, WorldType, GetHandlerCompileTime, ChestType>::cIncrementalRedstoneSimulatorChunkData *)a_Chunk->GetRedstoneSimulatorData();
+	if (m_RedstoneSimulatorChunkData == NULL)
+	{
+		m_RedstoneSimulatorChunkData = new cIncrementalRedstoneSimulator<ChunkType, WorldType, GetHandlerCompileTime, ChestType>::cIncrementalRedstoneSimulatorChunkData();
+		a_Chunk->SetRedstoneSimulatorData(m_RedstoneSimulatorChunkData);
+	}
 	if (m_RedstoneSimulatorChunkData->m_ChunkData.empty() && ((cIncrementalRedstoneSimulator<ChunkType, WorldType, GetHandlerCompileTime, ChestType>::cIncrementalRedstoneSimulatorChunkData *)a_Chunk->GetRedstoneSimulatorData())->m_QueuedChunkData.empty())
 	{
 		return;
diff --git a/tests/Redstone/creatable.cpp b/tests/Redstone/creatable.cpp
index f26ebe85c..02c622788 100644
--- a/tests/Redstone/creatable.cpp
+++ b/tests/Redstone/creatable.cpp
@@ -99,6 +99,7 @@ class MockChunk
 {
 public:
 	cRedstoneSimulatorChunkData * GetRedstoneSimulatorData() { return NULL; }
+	void SetRedstoneSimulatorData(cRedstoneSimulatorChunkData * a_Data) {}
 	bool IsRedstoneDirty() { return true; }
 	void SetIsRedstoneDirty(bool a_Param) {}