diff --git a/lib/AST/StmtSerialization.cpp b/lib/AST/StmtSerialization.cpp
index a860224..78a2cbc 100644
--- a/lib/AST/StmtSerialization.cpp
+++ b/lib/AST/StmtSerialization.cpp
@@ -1394,7 +1394,7 @@
 
 void CXXTypeidExpr::EmitImpl(llvm::Serializer& S) const {
   S.Emit(getType());
-  S.Emit(isTypeOperand());
+  S.EmitBool(isTypeOperand());
   if (isTypeOperand()) {
     S.Emit(getTypeOperand());
   } else {