diff --git a/lib/Frontend/PCHWriter.cpp b/lib/Frontend/PCHWriter.cpp
index 62e1299..0c640e7 100644
--- a/lib/Frontend/PCHWriter.cpp
+++ b/lib/Frontend/PCHWriter.cpp
@@ -356,6 +356,7 @@
   Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
   Record.push_back(D->getStorageClass()); // FIXME: stable encoding
   Record.push_back(D->isInline());
+  Record.push_back(D->isC99InlineDefinition());
   Record.push_back(D->isVirtual());
   Record.push_back(D->isPure());
   Record.push_back(D->inheritedPrototype());