diff --git a/src/decoder/plugins/OggDecoder.cxx b/src/decoder/plugins/OggDecoder.cxx
index e01c0f8eb..2dec9913a 100644
--- a/src/decoder/plugins/OggDecoder.cxx
+++ b/src/decoder/plugins/OggDecoder.cxx
@@ -68,6 +68,13 @@ OggDecoder::LoadEndGranulePos() const
 	return packet.granulepos;
 }
 
+inline void
+OggDecoder::SeekByte(offset_type offset)
+{
+	input_stream.LockSeek(offset);
+	PostSeek();
+}
+
 void
 OggDecoder::SeekGranulePos(ogg_int64_t where_granulepos)
 {
@@ -79,7 +86,6 @@ OggDecoder::SeekGranulePos(ogg_int64_t where_granulepos)
 	offset_type offset(where_granulepos * input_stream.GetSize()
 			   / end_granulepos);
 
-	input_stream.LockSeek(offset);
-	PostSeek();
+	SeekByte(offset);
 }
 
diff --git a/src/decoder/plugins/OggDecoder.hxx b/src/decoder/plugins/OggDecoder.hxx
index 33bf8d352..4783f1c6e 100644
--- a/src/decoder/plugins/OggDecoder.hxx
+++ b/src/decoder/plugins/OggDecoder.hxx
@@ -22,6 +22,7 @@
 
 #include "lib/xiph/OggVisitor.hxx"
 #include "decoder/Reader.hxx"
+#include "input/Offset.hxx"
 
 class OggDecoder : public OggVisitor {
 	ogg_int64_t end_granulepos;
@@ -53,6 +54,13 @@ protected:
 		return end_granulepos > 0;
 	}
 
+	/**
+	 * Seek the #InputStream and update the #OggVisitor.
+	 *
+	 * Throws on error.
+	 */
+	void SeekByte(offset_type offset);
+
 	void SeekGranulePos(ogg_int64_t where_granulepos);
 };