Index: src/Parser/lex.ll
===================================================================
--- src/Parser/lex.ll	(revision bcda04c57444ccd998e9f7511b75c66e90f0301a)
+++ src/Parser/lex.ll	(revision 626da64418241876f30b5a7cd87ebb6afaeef2c7)
@@ -256,5 +256,5 @@
 struct			{ KEYWORD_RETURN(STRUCT); }
 switch			{ KEYWORD_RETURN(SWITCH); }
-_Thread			{ KEYWORD_RETURN(THREAD); }				// C11
+thread			{ KEYWORD_RETURN(THREAD); }				// C11
 _Thread_local	{ KEYWORD_RETURN(THREADLOCAL); }		// C11
 throw			{ KEYWORD_RETURN(THROW); }				// CFA