diff --git a/lib/Frontend/PCHReader.cpp b/lib/Frontend/PCHReader.cpp
index e7404f8..8324f8d 100644
--- a/lib/Frontend/PCHReader.cpp
+++ b/lib/Frontend/PCHReader.cpp
@@ -400,8 +400,8 @@
   for (unsigned I = 0, N = MissingPredefines.size(); I != N; ++I) {
     const std::string &Missing = MissingPredefines[I];
     if (!startsWith(Missing, "#define ") != 0) {
-      fprintf(stderr, "FIXME: command line is missing a non-macro entry in the predefines buffer that was used to build the PCH file\n%s\n",
-              Missing.c_str());
+      Diag(diag::warn_pch_compiler_options_mismatch);
+      Diag(diag::note_ignoring_pch) << FileName;
       return true;
     }
     
@@ -492,8 +492,8 @@
   for (unsigned I = 0, N = ExtraPredefines.size(); I != N; ++I) {
     const std::string &Extra = ExtraPredefines[I];
     if (!startsWith(Extra, "#define ") != 0) {
-      fprintf(stderr, "FIXME: command line has extra predefines not used to build the PCH file.%s\n",
-              Extra.c_str());
+      Diag(diag::warn_pch_compiler_options_mismatch);
+      Diag(diag::note_ignoring_pch) << FileName;
       return true;
     }