diff --git a/hathor/transaction/storage/rocksdb_storage.py b/hathor/transaction/storage/rocksdb_storage.py
index b280ad750..95932d2c7 100644
--- a/hathor/transaction/storage/rocksdb_storage.py
+++ b/hathor/transaction/storage/rocksdb_storage.py
@@ -115,7 +115,7 @@ def _start_flush_thread(self) -> None:
             deferred.addErrback(self._err_flush_thread)
             self.cache_data.flush_deferred = deferred
 
-    def _cb_flush_thread(self) -> None:
+    def _cb_flush_thread(self, _res: None) -> None:
         self._reactor.callLater(self.cache_data.interval, self._start_flush_thread)
         self.cache_data.flush_deferred = None
 
diff --git a/hathor_tests/tx/test_cache_storage.py b/hathor_tests/tx/test_cache_storage.py
index 0cb8633d9..dba4e3d97 100644
--- a/hathor_tests/tx/test_cache_storage.py
+++ b/hathor_tests/tx/test_cache_storage.py
@@ -1,4 +1,9 @@
+from unittest.mock import Mock
+
+from twisted.internet.task import deferLater
+
 from hathor.daa import TestMode
+from hathor.reactor import get_global_reactor
 from hathor.simulator.utils import add_new_blocks
 from hathor.transaction import Transaction, TransactionMetadata
 from hathor.transaction.storage import TransactionRocksDBStorage
@@ -123,11 +128,13 @@ def test_flush_thread(self):
         # Flush deferred is not None
         self.assertIsNotNone(self.cache_storage.cache_data.flush_deferred)
         last_flush_deferred = self.cache_storage.cache_data.flush_deferred
+
+        # A call when the deferred already exists, shouldn't override it
         self.cache_storage._start_flush_thread()
         self.assertEqual(last_flush_deferred, self.cache_storage.cache_data.flush_deferred)
 
         # We flush the cache and flush_deferred becomes None
-        self.cache_storage._cb_flush_thread()
+        self.cache_storage._cb_flush_thread(None)
         self.assertIsNone(self.cache_storage.cache_data.flush_deferred)
         # After the interval it becomes not None again
         self.clock.advance(10)
@@ -143,6 +150,51 @@ def test_flush_thread(self):
         del self.cache_storage.cache_data.cache[next(iter(self.cache_storage.cache_data.dirty_txs))]
         self.cache_storage._flush_to_storage(self.cache_storage.cache_data.dirty_txs.copy())
 
+    async def test_flush_thread_global_reactor(self) -> None:
+        interval = 1
+        reactor = get_global_reactor()
+        artifacts = self.get_builder() \
+            .use_tx_storage_cache(capacity=5) \
+            .set_wallet(self._create_test_wallet(unlocked=True)) \
+            .set_reactor(reactor) \
+            .build()
+
+        self.manager = artifacts.manager
+        self.cache_storage = self.manager.tx_storage
+        self.cache_storage.cache_data.interval = interval
+
+        og_start_flush_thread = self.cache_storage._start_flush_thread
+        og_cb_flush_thread = self.cache_storage._cb_flush_thread
+        og_err_flush_thread = self.cache_storage._err_flush_thread
+
+        self.cache_storage._start_flush_thread = Mock(wraps=og_start_flush_thread)
+        self.cache_storage._cb_flush_thread = Mock(wraps=og_cb_flush_thread)
+        self.cache_storage._err_flush_thread = Mock(wraps=og_err_flush_thread)
+
+        self.manager.start()
+
+        txs = [self._get_new_tx(nonce) for nonce in range(CACHE_SIZE)]
+        for tx in txs:
+            self.cache_storage.save_transaction(tx)
+
+        for tx in txs:
+            assert tx.hash in self.cache_storage.cache_data.dirty_txs
+
+        assert self.cache_storage.cache_data.flush_deferred is None
+
+        assert self.cache_storage._start_flush_thread.call_count == 0
+        assert self.cache_storage._cb_flush_thread.call_count == 0
+        assert self.cache_storage._err_flush_thread.call_count == 0
+
+        await deferLater(reactor, interval + 0.1, lambda: None)
+
+        assert self.cache_storage._start_flush_thread.call_count == 1
+        assert self.cache_storage._cb_flush_thread.call_count == 1
+        assert self.cache_storage._err_flush_thread.call_count == 0
+
+        assert self.cache_storage.cache_data.flush_deferred is None
+        self.clean_pending(required_to_quiesce=False)
+
     def test_topological_sort_dfs(self):
         self.manager.daa.TEST_MODE = TestMode.TEST_ALL_WEIGHT
         add_new_blocks(self.manager, 11, advance_clock=1)