diff --git a/src/borg/testsuite/chunkers/interaction_test.py b/src/borg/testsuite/chunkers/interaction_test.py
index 4417dc423..45c175299 100644
--- a/src/borg/testsuite/chunkers/interaction_test.py
+++ b/src/borg/testsuite/chunkers/interaction_test.py
@@ -29,7 +29,7 @@ def test_reader_chunker_interaction(chunker_params):
     random_data = os.urandom(data_size // 3) + b"\0" * (data_size // 3) + os.urandom(data_size // 3)
 
     # Chunk the data
-    chunker = get_chunker(*chunker_params, sparse=True)
+    chunker = get_chunker(*chunker_params)
     data_file = BytesIO(random_data)
     chunks = list(chunker.chunkify(data_file))
 
diff --git a/src/borg/testsuite/chunkers/reader_test.py b/src/borg/testsuite/chunkers/reader_test.py
index f269d95cb..ff56350ee 100644
--- a/src/borg/testsuite/chunkers/reader_test.py
+++ b/src/borg/testsuite/chunkers/reader_test.py
@@ -170,7 +170,7 @@ def test_filereader_read_with_mock(mock_chunks, read_size, expected_data, expect
 )
 def test_filefmapreader_basic(file_content, read_size, expected_chunks):
     """Test basic functionality of FileFMAPReader with different file contents."""
-    reader = FileFMAPReader(fd=BytesIO(file_content), fh=-1, read_size=read_size, sparse=True, fmap=None)
+    reader = FileFMAPReader(fd=BytesIO(file_content), fh=-1, read_size=read_size, sparse=False, fmap=None)
 
     # Collect all chunks from blockify
     chunks = list(reader.blockify())
@@ -252,7 +252,7 @@ def test_filefmapreader_allocation_types(zeros_length, read_size, expected_alloc
     # Create a file with all zeros
     file_content = b"\0" * zeros_length
 
-    reader = FileFMAPReader(fd=BytesIO(file_content), fh=-1, read_size=read_size, sparse=True, fmap=None)
+    reader = FileFMAPReader(fd=BytesIO(file_content), fh=-1, read_size=read_size, sparse=False, fmap=None)
 
     # Collect all chunks from blockify
     chunks = list(reader.blockify())