diff --git a/fuzzers/005-tilegrid/add_tdb.py b/fuzzers/005-tilegrid/add_tdb.py
index fef89a34..9af351cc 100644
--- a/fuzzers/005-tilegrid/add_tdb.py
+++ b/fuzzers/005-tilegrid/add_tdb.py
@@ -111,7 +111,7 @@ def run(fn_in, fn_out, verbose=False):
         tdb_fns.append(("monitor/build/segbits_tilegrid.tdb", 30, 101))
     if os.path.exists("ps7/build/segbits_tilegrid.tdb"):
         # FIXME: height
-        tdb_fns.append(("ps7/build/segbits_tilegrid.tdb", 42, 2))
+        tdb_fns.append(("ps7/build/segbits_tilegrid.tdb", 36, 2))
 
     for (tdb_fn, frames, words) in tdb_fns:
         for (tile, frame, wordidx) in load_db(tdb_fn):