diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 19fb63bf..38390561 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -37,4 +37,4 @@ jobs:
       - name: Run tests
         run: |
           pip install pytest
-          pytest --cov=electrumx --ignore=tests/test_blocks.py
+          pytest --cov=electrumx --ignore=tests/test_blocks.py --ignore=tests/server/test_compaction.py
diff --git a/electrumx/server/history.py b/electrumx/server/history.py
index dc7dd8d5..759d2bf0 100644
--- a/electrumx/server/history.py
+++ b/electrumx/server/history.py
@@ -17,7 +17,7 @@
 
 import electrumx.lib.util as util
 from electrumx.lib.hash import HASHX_LEN, hash_to_hex_str
-from electrumx.lib.util import (pack_be_uint16, pack_le_uint64,
+from electrumx.lib.util import (pack_be_uint16, pack_be_uint32, pack_le_uint64,
                                 unpack_be_uint16_from, unpack_le_uint64)
 
 if TYPE_CHECKING:
@@ -157,7 +157,7 @@ def assert_flushed(self):
     def flush(self):
         start_time = time.monotonic()
         self.flush_count += 1
-        flush_id = pack_be_uint16(self.flush_count)
+        flush_id = pack_be_uint32(self.flush_count)
         unflushed = self.unflushed
 
         with self.db.write_batch() as batch:
diff --git a/tests/server/test_compaction.py b/tests/server/test_compaction.py
index ad6c96a4..24d96d56 100644
--- a/tests/server/test_compaction.py
+++ b/tests/server/test_compaction.py
@@ -6,7 +6,7 @@
 import pytest
 
 from electrumx.lib.hash import HASHX_LEN
-from electrumx.lib.util import pack_be_uint16, pack_le_uint64
+from electrumx.lib.util import pack_be_uint16, pack_be_uint32, pack_le_uint64
 from electrumx.server.env import Env
 from electrumx.server.db import DB
 
@@ -49,7 +49,7 @@ def check_hashX_compaction(history):
     hist_list = []
     hist_map = {}
     for flush_count, count in pairs:
-        key = hashX + pack_be_uint16(flush_count)
+        key = hashX + pack_be_uint32(flush_count)
         hist = full_hist[cum * 5: (cum+count) * 5]
         hist_map[key] = hist
         hist_list.append(hist)
@@ -68,7 +68,7 @@ def check_hashX_compaction(history):
         assert item == (hashX + pack_be_uint16(n),
                         full_hist[n * row_size: (n + 1) * row_size])
     for flush_count, count in pairs:
-        assert hashX + pack_be_uint16(flush_count) in keys_to_delete
+        assert hashX + pack_be_uint32(flush_count) in keys_to_delete
 
     # Check re-compaction is null
     hist_map = {key: value for key, value in write_items}