diff --git a/clang/lib/Lex/Preprocessor.cpp b/clang/lib/Lex/Preprocessor.cpp
index d85df38..adbee6e 100644
--- a/clang/lib/Lex/Preprocessor.cpp
+++ b/clang/lib/Lex/Preprocessor.cpp
@@ -59,12 +59,11 @@
                            const TargetInfo *target, SourceManager &SM,
                            HeaderSearch &Headers, ModuleLoader &TheModuleLoader,
                            IdentifierInfoLookup *IILookup, bool OwnsHeaders,
-                           bool DelayInitialization, bool IncrProcessing,
-                           TranslationUnitKind TUKind)
+                           bool DelayInitialization, TranslationUnitKind TUKind)
     : PPOpts(PPOpts), Diags(&diags), LangOpts(opts), Target(target),
       FileMgr(Headers.getFileMgr()), SourceMgr(SM), HeaderInfo(Headers),
       TheModuleLoader(TheModuleLoader), ExternalSource(0),
-      Identifiers(opts, IILookup), IncrementalProcessing(IncrProcessing),
+      Identifiers(opts, IILookup), IncrementalProcessing(false),
       TUKind(TUKind),
       CodeComplete(0), CodeCompletionFile(0), CodeCompletionOffset(0),
       LastTokenWasAt(false), ModuleImportExpectsIdentifier(false),