diff --git a/swift/common/utils.py b/swift/common/utils.py
index c2499821f4..51b656c5c3 100644
--- a/swift/common/utils.py
+++ b/swift/common/utils.py
@@ -975,14 +975,13 @@ class _LibcWrapper(object):
                 # spurious AttributeError.
                 func_handle = load_libc_function(
                     func_name, fail_if_missing=True)
+                self._func_handle = func_handle
             except AttributeError:
                 # We pass fail_if_missing=True to load_libc_function and
                 # then ignore the error. It's weird, but otherwise we have
                 # to check if self._func_handle is noop_libc_function, and
                 # that's even weirder.
                 pass
-            else:
-                self._func_handle = func_handle
             self._loaded = True
 
     @property
diff --git a/test/unit/common/test_utils.py b/test/unit/common/test_utils.py
index 8f26565e12..448ae66a89 100644
--- a/test/unit/common/test_utils.py
+++ b/test/unit/common/test_utils.py
@@ -7980,6 +7980,15 @@ class TestFallocate(unittest.TestCase):
         # work the way you'd expect with ctypes :-/
         self.assertEqual(sys_fallocate_mock.mock_calls[0][1][2].value, 0)
         self.assertEqual(sys_fallocate_mock.mock_calls[0][1][3].value, 0)
+        sys_fallocate_mock.reset_mock()
+
+        # negative size will be adjusted as 0
+        utils.fallocate(0, -1, 0)
+        self.assertEqual(
+            [mock.call(0, utils.FALLOC_FL_KEEP_SIZE, mock.ANY, mock.ANY)],
+            sys_fallocate_mock.mock_calls)
+        self.assertEqual(sys_fallocate_mock.mock_calls[0][1][2].value, 0)
+        self.assertEqual(sys_fallocate_mock.mock_calls[0][1][3].value, 0)
 
 
 @patch.object(os, 'fstatvfs')
@@ -8171,6 +8180,8 @@ class TestPunchHole(unittest.TestCase):
 
         with self.assertRaises(ValueError):
             utils.punch_hole(0, 1, -1)
+        with self.assertRaises(ValueError):
+            utils.punch_hole(0, 1 << 64, 1)
         with self.assertRaises(ValueError):
             utils.punch_hole(0, -1, 1)
         with self.assertRaises(ValueError):