Index: source/BlockID.h
===================================================================
--- source/BlockID.h	(revision 952)
+++ source/BlockID.h	(working copy)
@@ -161,6 +161,7 @@
 	E_BLOCK_POTATOES = 142,
 	E_BLOCK_WOODEN_BUTTON = 143,
 	E_BLOCK_HEAD = 144,
+	E_BLOCK_ANVIL = 145,
 };
 //tolua_end
 
Index: source/SandSimulator.cpp
===================================================================
--- source/SandSimulator.cpp	(revision 952)
+++ source/SandSimulator.cpp	(working copy)
@@ -64,7 +64,9 @@
 bool cSandSimulator::IsAllowedBlock( BLOCKTYPE a_BlockType )
 {
 	return a_BlockType == E_BLOCK_SAND
-		|| a_BlockType == E_BLOCK_GRAVEL;
+		|| a_BlockType == E_BLOCK_GRAVEL
+	    || a_BlockType == E_BLOCK_DRAGON_EGG
+	    || a_BlockType == E_BLOCK_ANVIL;
 }