diff --git a/Lex/Preprocessor.cpp b/Lex/Preprocessor.cpp
index c0dde23..baabd8e 100644
--- a/Lex/Preprocessor.cpp
+++ b/Lex/Preprocessor.cpp
@@ -430,7 +430,7 @@
 
 
 /// EnterMainSourceFile - Enter the specified FileID as the main source file,
-/// which implicitly adds the builting defines etc.
+/// which implicitly adds the builtin defines etc.
 void Preprocessor::EnterMainSourceFile() {
   
   unsigned MainFileID = SourceMgr.getMainFileID();