diff --git a/src/memory/persistent.py b/src/memory/persistent.py
index ea93e23e..e3240345 100644
--- a/src/memory/persistent.py
+++ b/src/memory/persistent.py
@@ -114,7 +114,7 @@ class PersistentDict(object):
         return self._cache.__setitem__(key, value)
 
     def __delitem__(self, key):
-        self.storage.detPrivateValue(self.namepace, key, self.binary, self.profile)
+        self.storage.delPrivateValue(self.namespace, key, self.binary, self.profile)
         return self._cache.__delitem__(key)
 
     def get(self, key, default=None):
@@ -209,7 +209,7 @@ class LazyPersistentBinaryDict(PersistentBinaryDict):
         self.storage.setPrivateValue(self.namespace, key, value, self.binary, self.profile)
 
     def __delitem__(self, key):
-        self.storage.detPrivateValue(self.namepace, key, self.binary, self.profile)
+        self.storage.delPrivateValue(self.namespace, key, self.binary, self.profile)
 
     def _valueOrDefault(self, value, default):
         if value is None: