diff --git a/Lib/functools.py b/Lib/functools.py
index 02bff42bd3f..9846a557608 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -308,7 +308,7 @@ def wrapper(*args, **kwds):
                         last = root[PREV]
                         link = [last, root, key, result]
                         last[NEXT] = root[PREV] = cache[key] = link
-                        full = (len(cache) == maxsize)
+                        full = (len(cache) >= maxsize)
                     misses += 1
                 return result