diff --git a/test/runtests.jl b/test/runtests.jl
index 3aa1d0f..704aa4f 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -30,6 +30,9 @@ using Test
     TranscodingStreams.test_roundtrip_read(XzCompressorStream, XzDecompressorStream)
     TranscodingStreams.test_roundtrip_write(XzCompressorStream, XzDecompressorStream)
     TranscodingStreams.test_roundtrip_lines(XzCompressorStream, XzDecompressorStream)
+    if isdefined(TranscodingStreams, :test_roundtrip_seekstart)
+        TranscodingStreams.test_roundtrip_seekstart(XzCompressorStream, XzDecompressorStream)
+    end
     TranscodingStreams.test_roundtrip_transcode(XzCompressor, XzDecompressor)
 
     @test_throws ArgumentError XzCompressor(level=10)