diff --git a/ChangeLog b/ChangeLog
index 6810c5a..1977294 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+* Fix bug with wraparound detection when the duplicate ID block gets
+  cut off by the DMK buffer filling up.  The fix is to stop decoding
+  when the buffer fills up, so that we don't detect such a header in
+  the first place.
+
 4.10.0 -- Mon Mar 11 19:30:33 UTC 2024 -- Tim Mann, Quentin Barnes
 
 * Add -S option.  This option allows the user to specify a minimum
diff --git a/cw2dmk.c b/cw2dmk.c
index b90e3b0..f3cd362 100644
--- a/cw2dmk.c
+++ b/cw2dmk.c
@@ -852,6 +852,7 @@ process_bit(int bit)
   unsigned char val = 0;
   int i;
 
+  if (dmk_full) return;
   accum = (accum << 1) + bit;
   taccum = (taccum << 1) + bit;
   bits++;