diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index a385eec..85bc281 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -4622,9 +4622,9 @@
   WritingAST = false;
   if (SemaRef.Context.getLangOpts().ImplicitModules && WritingModule) {
     // Construct MemoryBuffer and update buffer manager.
-    ModuleCache.addBuffer(OutputFile,
-                          llvm::MemoryBuffer::getMemBufferCopy(
-                              StringRef(Buffer.begin(), Buffer.size())));
+    ModuleCache.addBuiltPCM(OutputFile,
+                            llvm::MemoryBuffer::getMemBufferCopy(
+                                StringRef(Buffer.begin(), Buffer.size())));
   }
   return Signature;
 }