diff --git a/quantum/api/extensions.py b/quantum/api/extensions.py
index 1679ebfceae..f1ae2785415 100644
--- a/quantum/api/extensions.py
+++ b/quantum/api/extensions.py
@@ -484,7 +484,7 @@ class ExtensionManager(object):
         if hasattr(extension, 'check_env'):
             try:
                 extension.check_env()
-            except exceptions.InvalidExtenstionEnv as ex:
+            except exceptions.InvalidExtensionEnv as ex:
                 LOG.warn(_("Exception loading extension: %s"), unicode(ex))
                 return False
         return True
diff --git a/quantum/common/exceptions.py b/quantum/common/exceptions.py
index a2997bca692..71d1d9da9d9 100644
--- a/quantum/common/exceptions.py
+++ b/quantum/common/exceptions.py
@@ -242,7 +242,7 @@ class InvalidSharedSetting(Conflict):
                 "%(network)s. Multiple tenants are using it")
 
 
-class InvalidExtenstionEnv(BadRequest):
+class InvalidExtensionEnv(BadRequest):
     message = _("Invalid extension environment: %(reason)s")
 
 
diff --git a/quantum/extensions/portsecurity.py b/quantum/extensions/portsecurity.py
index 90e7ebfbd69..85b83ccbdf5 100644
--- a/quantum/extensions/portsecurity.py
+++ b/quantum/extensions/portsecurity.py
@@ -31,7 +31,7 @@ class PortSecurityAndIPRequiredForSecurityGroups(qexception.InvalidInput):
                 " address in order to use security groups.")
 
 
-class PortSecurityBindingNotFound(qexception.InvalidExtenstionEnv):
+class PortSecurityBindingNotFound(qexception.InvalidExtensionEnv):
     message = _("Port does not have port security binding.")
 
 PORTSECURITY = 'port_security_enabled'