diff --git a/indra/newview/llviewermessage.cpp b/indra/newview/llviewermessage.cpp
index 8fcf49e21dc0dae3a138889dc53be8d705613dea..d086d4561f084c96b9534fe2131b8405da4065b6 100755
--- a/indra/newview/llviewermessage.cpp
+++ b/indra/newview/llviewermessage.cpp
@@ -2619,7 +2619,7 @@ void process_improved_im(LLMessageSystem *msg, void **user_data)
 
 			// The group notice packet does not have an AgentID.  Obtain one from the name cache.
 			// If last name is "Resident" strip it out so the cache name lookup works.
-			U32 index = original_name.find(" Resident");
+			size_t index = original_name.find(" Resident");
 			if (index != std::string::npos)
 			{
 				original_name = original_name.substr(0, index);