diff --git a/tools/db_crashtest.py b/tools/db_crashtest.py
index 1910e4fe8..559cef817 100644
--- a/tools/db_crashtest.py
+++ b/tools/db_crashtest.py
@@ -36,7 +36,7 @@ default_params = {
     "bloom_bits": lambda: random.choice([random.randint(0,19),
                                          random.lognormvariate(2.3, 1.3)]),
     "cache_index_and_filter_blocks": lambda: random.randint(0, 1),
-    "cache_size": 1048576,
+    "cache_size": 8388608,
     "checkpoint_one_in": 1000000,
     "compression_type": lambda: random.choice(
         ["none", "snappy", "zlib", "lz4", "lz4hc", "xpress", "zstd"]),
@@ -134,7 +134,7 @@ default_params = {
         [0, 0, 0, 1024 * 1024, 8 * 1024 * 1024, 128 * 1024 * 1024]),
     "avoid_unnecessary_blocking_io" : random.randint(0, 1),
     "write_dbid_to_manifest" : random.randint(0, 1),
-    "avoid_flush_during_recovery" : random.choice(
+    "avoid_flush_during_recovery" : lambda: random.choice(
         [1 if t == 0 else 0 for t in range(0, 8)]),
     "max_write_batch_group_size_bytes" : lambda: random.choice(
         [16, 64, 1024 * 1024, 16 * 1024 * 1024]),