diff --git a/tests/test_compat.py b/tests/test_compat.py
index 55487c8e..3f339851 100644
--- a/tests/test_compat.py
+++ b/tests/test_compat.py
@@ -20,7 +20,7 @@
 import zlib
 from pathlib import Path
 
-from isal import igzip, isal_zlib
+from isal import igzip, igzip_lib, isal_zlib
 
 import pytest
 
@@ -129,6 +129,16 @@ def test_decompress_isal_zlib(data_size, level):
     assert decompressed == data
 
 
+@pytest.mark.parametrize("module", [isal_zlib, igzip_lib])
+def test_decompress_bufsize(module):
+    data = DATA[:10_000]
+    compressed = module.compress(data)
+    # Like zlib.decompress, decompress accepts a bufsize of 0.
+    assert module.decompress(compressed, bufsize=0) == data
+    with pytest.raises(ValueError, match="bufsize must be non-negative"):
+        module.decompress(compressed, bufsize=-1)
+
+
 @pytest.mark.parametrize(["data_size", "level", "wbits", "memLevel"],
                          list(itertools.product([128 * 1024], range(4),
                                                 WBITS_RANGE, range(1, 10))))