diff --git a/tools/db_crashtest.py b/tools/db_crashtest.py
index 51cbcbe6d..a2b0caae8 100644
--- a/tools/db_crashtest.py
+++ b/tools/db_crashtest.py
@@ -23,7 +23,6 @@ default_params = {
     "destroy_db_initially": 0,
     "disable_data_sync": 0,
     "disable_wal": 0,
-    "filter_deletes": lambda: random.randint(0, 1),
     "allow_concurrent_memtable_write": 0,
     "iterpercent": 10,
     "max_background_compactions": 20,
@@ -87,7 +86,6 @@ simple_default_params = {
     "destroy_db_initially": 0,
     "disable_data_sync": 0,
     "disable_wal": 0,
-    "filter_deletes": lambda: random.randint(0, 1),
     "allow_concurrent_memtable_write": lambda: random.randint(0, 1),
     "iterpercent": 10,
     "max_background_compactions": 1,
@@ -135,9 +133,7 @@ whitebox_simple_default_params = {
 def finalize_and_sanitize(src_params):
     dest_params = dict([(k,  v() if callable(v) else v)
                         for (k, v) in src_params.items()])
-    # --allow_concurrent_memtable_write with --filter_deletes is not supported.
     if dest_params.get("allow_concurrent_memtable_write", 1) == 1:
-        dest_params["filter_deletes"] = 0
         dest_params["memtablerep"] = "skip_list"
     return dest_params