diff --git a/indra/llmessage/llpartdata.cpp b/indra/llmessage/llpartdata.cpp
index 41a0310ce..a89fba530 100644
--- a/indra/llmessage/llpartdata.cpp
+++ b/indra/llmessage/llpartdata.cpp
@@ -294,14 +294,14 @@ BOOL LLPartSysData::unpack(LLDataPacker &dp)
 		//skip to LLPartData block
 		U8 feh = 0;
 		
-		for (U32 i = 0; i < size; ++i)
+		for (S32 i = 0; i < size; ++i)
 		{
 			dp.unpackU8(feh, "whippang");
 		}
 				
 		dp.unpackS32(size, "partsize");
 		//skip LLPartData block
-		for (U32 i = 0; i < size; ++i)
+		for (S32 i = 0; i < size; ++i)
 		{
 			dp.unpackU8(feh, "whippang");
 		}