1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 9bf14c791b..4563d2a409 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -612,8 +612,9 @@ bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
   bool Success = true;
 
   Opts.DiagnosticLogFile = Args.getLastArgValue(OPT_diagnostic_log_file);
-  Opts.DiagnosticSerializationFile =
-    Args.getLastArgValue(OPT_diagnostic_serialized_file);
+  if (Arg *A =
+          Args.getLastArg(OPT_diagnostic_serialized_file, OPT__serialize_diags))
+    Opts.DiagnosticSerializationFile = A->getValue();
   Opts.IgnoreWarnings = Args.hasArg(OPT_w);
   Opts.NoRewriteMacros = Args.hasArg(OPT_Wno_rewrite_macros);
   Opts.Pedantic = Args.hasArg(OPT_pedantic);