diff --git a/py3cache/PyInMem.py b/py3cache/PyInMem.py
index f73dec2d5da4a1ff3bd1dd5b1ee4f759d52ffb5f..5777d5b7452778fb0c4acf2cd362c0b9416a6ac3 100644
--- a/py3cache/PyInMem.py
+++ b/py3cache/PyInMem.py
@@ -4,6 +4,7 @@
 Python Mem Cache with cache evict callback
 """
 import configparser
+import sys
 import os
 from time import time
 
@@ -67,6 +68,16 @@ class PyInMem:
         if self.callback is not None:
             self.callback('evict', region, key)
 
+    def evict_expired(self, region):
+        if sys.version < '3':
+            items = self.cachetime[region].items()
+        else:
+            items = self.cachetime[region].copy().items()
+
+        for (key, ctime) in items:
+            if (ctime.expire > 0) and (time() - ctime.begin > ctime.expire):
+                self.evict(region, key)
+
     def _clear(self, region):
         self.regions[region].clear()
         self.cachetime[region].clear()