diff --git a/src/emu/emu_stream.c b/src/emu/emu_stream.c
index 9ea0b05..ba5442e 100644
--- a/src/emu/emu_stream.c
+++ b/src/emu/emu_stream.c
@@ -130,3 +130,9 @@ emu_stream_data_get(struct emu_stream *stream)
 {
 	return stream->data;
 }
+
+void
+emu_stream_clkoff(struct emu_stream *stream, int64_t clkoff)
+{
+	stream->clock_offset = clkoff;
+}
diff --git a/src/emu/emu_stream.h b/src/emu/emu_stream.h
index 05f4810..9d8a81b 100644
--- a/src/emu/emu_stream.h
+++ b/src/emu/emu_stream.h
@@ -35,6 +35,8 @@ struct emu_stream {
 int emu_stream_load(struct emu_stream *stream,
 		const char *tracedir, const char *relpath);
 
+void emu_stream_clkoff(struct emu_stream *stream, int64_t clock_offset);
+
 void emu_stream_data_set(struct emu_stream *stream, void *data);
 void *emu_stream_data_get(struct emu_stream *stream);