diff --git a/MoreLinq/Permutations.cs b/MoreLinq/Permutations.cs
index b700e46fc..fd9698468 100644
--- a/MoreLinq/Permutations.cs
+++ b/MoreLinq/Permutations.cs
@@ -103,7 +103,14 @@ public void Reset()
                 _hasMoreResults = true; // there's always at least one permutation: the original set itself
             }
 
-            public IList<T> Current => _current!;
+            public IList<T> Current
+            {
+                get
+                {
+                    Debug.Assert(_current is not null);
+                    return _current;
+                }
+            }
 
             object IEnumerator.Current => Current;