diff --git a/src/backends/meta-screen-cast-stream-src.c b/src/backends/meta-screen-cast-stream-src.c
index 4b7911957..992168107 100644
--- a/src/backends/meta-screen-cast-stream-src.c
+++ b/src/backends/meta-screen-cast-stream-src.c
@@ -91,7 +91,7 @@ typedef struct _MetaScreenCastStreamSrcPrivate
   struct spa_video_info_raw video_format;
   int video_stride;
 
-  uint64_t last_frame_timestamp_us;
+  int64_t last_frame_timestamp_us;
 
   GHashTable *dmabuf_handles;