diff --git a/das/das.nim b/das/das.nim
index 71cfed6..f7790a8 100644
--- a/das/das.nim
+++ b/das/das.nim
@@ -101,6 +101,7 @@ when isMainModule:
       upload_timeout = 5.seconds
       sampling_timeout = 5.seconds
     assert(log2(blocksize.float).ceil.int <= segmentsize * 8 )
+    assert(samplesize <= blocksize)
 
     var
       segmentIDs = newSeq[NodeId](blocksize)