diff --git a/stegano/lsbset/generators.py b/stegano/lsbset/generators.py
index f0bdee9..b82371c 100644
--- a/stegano/lsbset/generators.py
+++ b/stegano/lsbset/generators.py
@@ -118,14 +118,14 @@ def ackermann_naive(m: int, n: int) -> int:
         return ackermann(m - 1, ackermann(m, n - 1))
 
 
-def ackermann(m: int, n: int) -> int:
+def ackermann_fast(m: int, n: int) -> int:
     """Ackermann number.
     """
     while m >= 4:
         if n == 0:
             n = 1
         else:
-            n = ackermann(m, n - 1)
+            n = ackermann_fast(m, n - 1)
         m -= 1
     if m == 3:
         return (1 << n + 3) - 3
@@ -136,6 +136,13 @@ def ackermann(m: int, n: int) -> int:
     else:
         return n + 1
 
+def ackermann(m: int) -> Iterator[int]:
+    """Ackermann written as a generator.
+    """
+    n = 0
+    while True:
+        yield ackermann_fast(m, n)
+        n += 1
 
 def fibonacci() -> Iterator[int]:
     """Generate the sequence of Fibonacci.
diff --git a/tests/test_lsbset.py b/tests/test_lsbset.py
index 82fe754..548cac8 100644
--- a/tests/test_lsbset.py
+++ b/tests/test_lsbset.py
@@ -54,6 +54,18 @@ class TestLSBSet(unittest.TestCase):
                                     generators.eratosthenes())
 
             self.assertEqual(message, clear_message)
+
+    def test_hide_and_reveal_with_ackermann(self):
+        messages_to_hide = ["foo"]
+        for message in messages_to_hide:
+            secret = lsbset.hide("./tests/sample-files/Lenna.png", message,
+                                    generators.ackermann(m=3))
+            secret.save("./image.png")
+
+            clear_message = lsbset.reveal("./image.png",
+                                    generators.ackermann(m=3))
+
+            self.assertEqual(message, clear_message)
             
     def test_hide_and_reveal_with_shift(self):
         messages_to_hide = ["a", "foo", "Hello World!", ":Python:"]