diff --git a/subprojects/gst-plugins-good/gst/isomp4/gstisoff.c b/subprojects/gst-plugins-good/gst/isomp4/gstisoff.c
index 829a73af99..a6a6422052 100644
--- a/subprojects/gst-plugins-good/gst/isomp4/gstisoff.c
+++ b/subprojects/gst-plugins-good/gst/isomp4/gstisoff.c
@@ -113,7 +113,7 @@ gst_isoff_qt_sidx_parser_add_data (GstSidxParser * parser,
       if (parser->sidx.version == 0) {
         parser->sidx.earliest_pts =
             gst_byte_reader_get_uint32_be_unchecked (&reader);
-        parser->sidx.first_offset = parser->sidx.earliest_pts =
+        parser->sidx.first_offset =
             gst_byte_reader_get_uint32_be_unchecked (&reader);
       } else {
         parser->sidx.earliest_pts =