diff --git a/include/llvm/Bitcode/BitstreamWriter.h b/include/llvm/Bitcode/BitstreamWriter.h
index 78b4f5e02ca..49fce1fcc81 100644
--- a/include/llvm/Bitcode/BitstreamWriter.h
+++ b/include/llvm/Bitcode/BitstreamWriter.h
@@ -79,6 +79,9 @@ public:
 
   std::vector<unsigned char> &getBuffer() { return Out; }
 
+  /// \brief Retrieve the current position in the stream, in bits.
+  uint64_t GetCurrentBitNo() const { return Out.size() * CHAR_BIT + CurBit; }
+
   //===--------------------------------------------------------------------===//
   // Basic Primitives for emitting bits to the stream.
   //===--------------------------------------------------------------------===//