diff --git a/subprojects/gst-plugins-good/gst/isomp4/fourcc.h b/subprojects/gst-plugins-good/gst/isomp4/fourcc.h
index 0865a18c9d..c17dbe0956 100644
--- a/subprojects/gst-plugins-good/gst/isomp4/fourcc.h
+++ b/subprojects/gst-plugins-good/gst/isomp4/fourcc.h
@@ -54,6 +54,7 @@ G_BEGIN_DECLS
 #define FOURCC_FMP4     GST_MAKE_FOURCC('F','M','P','4')
 #define FOURCC_H264     GST_MAKE_FOURCC('H','2','6','4')
 #define FOURCC_H265     GST_MAKE_FOURCC('H','2','6','5')
+#define FOURCC_LAGS     GST_MAKE_FOURCC('L','A','G','S')
 #define FOURCC_MAC3     GST_MAKE_FOURCC('M','A','C','3')
 #define FOURCC_MAC6     GST_MAKE_FOURCC('M','A','C','6')
 #define FOURCC_MP4V     GST_MAKE_FOURCC('M','P','4','V')
diff --git a/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c b/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
index 84f56974f1..1336324aa4 100644
--- a/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
+++ b/subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
@@ -15846,6 +15846,10 @@ qtdemux_video_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
       g_free (format);
       break;
     }
+    case FOURCC_LAGS:
+      _codec ("Lagarith lossless video codec");
+      caps = gst_caps_new_empty_simple ("video/x-lagarith");
+      break;
     case GST_MAKE_FOURCC ('k', 'p', 'c', 'd'):
     default:
     {