diff --git a/lib/Lex/PTHLexer.cpp b/lib/Lex/PTHLexer.cpp
index c5fc6f3..8d04736 100644
--- a/lib/Lex/PTHLexer.cpp
+++ b/lib/Lex/PTHLexer.cpp
@@ -423,7 +423,7 @@
 unsigned PTHLexer::getSpelling(SourceLocation sloc, const char *&Buffer) {
   SourceManager& SM = PP->getSourceManager();
   sloc = SM.getPhysicalLoc(sloc);
-  unsigned fid = sloc.getFileID();
+  unsigned fid = SM.getCanonicalFileID(sloc);
   unsigned fpos = SM.getFullFilePos(sloc);
   
   return (fid == FileID ) ? MySpellingSrch.getSpellingLinearSearch(fpos, Buffer)