diff --git a/indra/llcommon/llstring.cpp b/indra/llcommon/llstring.cpp
index f9128b574..e1641c8cc 100644
--- a/indra/llcommon/llstring.cpp
+++ b/indra/llcommon/llstring.cpp
@@ -1401,7 +1401,7 @@ void LLStringUtilBase<T>::testHarness()
 	
 	s2.erase( 4, 1 );
 	llassert( s2 == "hell");
-	s2.insert( 0, 'y' );
+	s2.insert( 0, std::string('y') );
 	llassert( s2 == "yhell");
 	s2.erase( 1, 3 );
 	llassert( s2 == "yl");