diff --git a/include/llvm/Support/StreamableMemoryObject.h b/include/llvm/Support/StreamableMemoryObject.h
index c73e03a3f7a..ab480864d0f 100644
--- a/include/llvm/Support/StreamableMemoryObject.h
+++ b/include/llvm/Support/StreamableMemoryObject.h
@@ -153,7 +153,7 @@ private:
   bool fetchToPos(size_t Pos) {
     if (EOFReached) return Pos < ObjectSize;
     while (Pos >= BytesRead) {
-      Bytes.resize(BytesRead + kChunkSize);
+      Bytes.resize(BytesRead + BytesSkipped + kChunkSize);
       size_t bytes = Streamer->GetBytes(&Bytes[BytesRead + BytesSkipped],
                                         kChunkSize);
       BytesRead += bytes;