diff --git a/indra/llxuixml/llinitparam.cpp b/indra/llxuixml/llinitparam.cpp
index 4c050844f86691e41deacade72d0b56027ee2332..d908c85da644282baebeb455bcc105103e4b7178 100644
--- a/indra/llxuixml/llinitparam.cpp
+++ b/indra/llxuixml/llinitparam.cpp
@@ -85,7 +85,8 @@ namespace LLInitParam
 	//
 	BaseBlock::BaseBlock()
 	:	mLastChangedParam(0),
-		mChangeVersion(0)
+		mChangeVersion(0),
+		mBlockDescriptor(NULL)
 	{}
 
 	BaseBlock::~BaseBlock()