diff --git a/src/borg/archive.py b/src/borg/archive.py
index 9415ac7ce..6c28353ee 100644
--- a/src/borg/archive.py
+++ b/src/borg/archive.py
@@ -322,7 +322,7 @@ class ChunkBuffer:
         self.packer = msgpack.Packer()
         self.chunks = []
         self.key = key
-        self.chunker = get_chunker(*chunker_params, seed=self.key.chunk_seed)
+        self.chunker = get_chunker(*chunker_params, seed=self.key.chunk_seed, sparse=False)
 
     def add(self, item):
         self.buffer.write(self.packer.pack(item.as_dict()))
@@ -2380,7 +2380,7 @@ class ArchiveRecreater:
             checkpoint_interval=self.checkpoint_interval,
             rechunkify=target.recreate_rechunkify,
         ).process_file_chunks
-        target.chunker = get_chunker(*target.chunker_params, seed=self.key.chunk_seed)
+        target.chunker = get_chunker(*target.chunker_params, seed=self.key.chunk_seed, sparse=False)
         return target
 
     def create_target_archive(self, name):
diff --git a/src/borg/testsuite/archiver/recreate_cmd.py b/src/borg/testsuite/archiver/recreate_cmd.py
index 31caa5c4e..67cc13843 100644
--- a/src/borg/testsuite/archiver/recreate_cmd.py
+++ b/src/borg/testsuite/archiver/recreate_cmd.py
@@ -154,6 +154,23 @@ class ArchiverTestCase(ArchiverTestCaseBase):
             )
         )
 
+    def test_recreate_fixed_rechunkify(self):
+        with open(os.path.join(self.input_path, "file"), "wb") as fd:
+            fd.write(b"a" * 8192)
+        self.cmd(f"--repo={self.repository_location}", "rcreate", RK_ENCRYPTION)
+        self.cmd(f"--repo={self.repository_location}", "create", "test", "input", "--chunker-params", "7,9,8,128")
+        output = self.cmd(
+            f"--repo={self.repository_location}", "list", "test", "input/file", "--format", "{num_chunks}"
+        )
+        num_chunks = int(output)
+        assert num_chunks > 2
+        self.cmd(f"--repo={self.repository_location}", "recreate", "--chunker-params", "fixed,4096")
+        output = self.cmd(
+            f"--repo={self.repository_location}", "list", "test", "input/file", "--format", "{num_chunks}"
+        )
+        num_chunks = int(output)
+        assert num_chunks == 2
+
     def test_recreate_recompress(self):
         self.create_regular_file("compressible", size=10000)
         self.cmd(f"--repo={self.repository_location}", "rcreate", RK_ENCRYPTION)