diff --git a/libobs/obs-source-deinterlace.c b/libobs/obs-source-deinterlace.c
index 319a1be62..c65540514 100644
--- a/libobs/obs-source-deinterlace.c
+++ b/libobs/obs-source-deinterlace.c
@@ -37,6 +37,7 @@ static bool ready_deinterlace_frames(obs_source_t *source, uint64_t sys_time)
 		if (source->async_frames.num == 2)
 			source->async_frames.array[0]->prev_frame = true;
 		source->deinterlace_offset = 0;
+		source->last_frame_ts = next_frame->timestamp;
 		return true;
 	}
 
diff --git a/libobs/obs-source.c b/libobs/obs-source.c
index 6423a2adb..e1f2be104 100644
--- a/libobs/obs-source.c
+++ b/libobs/obs-source.c
@@ -2513,6 +2513,7 @@ static bool ready_async_frame(obs_source_t *source, uint64_t sys_time)
 			next_frame = source->async_frames.array[0];
 		}
 
+		source->last_frame_ts = next_frame->timestamp;
 		return true;
 	}