diff --git a/core/CDataPack.h b/core/CDataPack.h
index 48883f0d..ec1195d2 100644
--- a/core/CDataPack.h
+++ b/core/CDataPack.h
@@ -61,6 +61,7 @@ public: //IDataPack
 	void PackFunction(cell_t function);
 public:
 	void Initialize();
+	inline size_t GetCapacity() const { return m_capacity; }
 private:
 	void CheckSize(size_t sizetype);
 private:
diff --git a/core/logic/smn_datapacks.cpp b/core/logic/smn_datapacks.cpp
index 9a369dbe..9d39c052 100644
--- a/core/logic/smn_datapacks.cpp
+++ b/core/logic/smn_datapacks.cpp
@@ -31,9 +31,14 @@
 
 #include "common_logic.h"
 #include <IHandleSys.h>
-#include <IDataPack.h>
 #include <ISourceMod.h>
 
+// This just in from the bucket o' hacks department.
+// One day, IDataPack will go away and CDataPack will be merged into this file.
+// This internal header is included directly to access GetCapacity,
+// which can not be added to the public interface due to ABI issues.
+#include "../CDataPack.h"
+
 HandleType_t g_DataPackType;
 
 class DataPackNatives : 
@@ -63,6 +68,12 @@ public:
 	{
 		g_pSM->FreeDataPack(reinterpret_cast<IDataPack *>(object));
 	}
+	bool GetHandleApproxSize(HandleType_t type, void *object, unsigned int *pSize)
+	{
+		CDataPack *pack = reinterpret_cast<CDataPack *>(object);
+		*pSize = sizeof(CDataPack) + pack->GetCapacity();
+		return true;
+	}
 };
 
 static cell_t smn_CreateDataPack(IPluginContext *pContext, const cell_t *params)