diff --git a/src/emu/ovnidump.c b/src/emu/ovnidump.c
index 10a36dc..5eb1155 100644
--- a/src/emu/ovnidump.c
+++ b/src/emu/ovnidump.c
@@ -23,7 +23,7 @@ emit(struct player *player)
 	struct stream *stream = player_stream(player);
 
 	/* Use raw clock in the ovni event */
-	int64_t rel = ev->rclock - c;
+	int64_t rel = stream->deltaclock;
 	c = ev->rclock;
 
 	printf("%s  %10ld  %+10ld  %c%c%c",
diff --git a/src/emu/stream.c b/src/emu/stream.c
index 76715b6..7e8a422 100644
--- a/src/emu/stream.c
+++ b/src/emu/stream.c
@@ -232,6 +232,7 @@ stream_step(struct stream *stream)
 		}
 	}
 
+	stream->deltaclock = clock - stream->lastclock;
 	stream->lastclock = clock;
 
 	return 0;
diff --git a/src/emu/stream.h b/src/emu/stream.h
index 93463da..2bbfd13 100644
--- a/src/emu/stream.h
+++ b/src/emu/stream.h
@@ -15,6 +15,7 @@ struct stream {
 	uint8_t *buf;
 	int64_t size;
 	int64_t lastclock;
+	int64_t deltaclock;
 	int64_t clock_offset;
 
 	heap_node_t hh;