diff --git a/impacket/krb5/kerberosv5.py b/impacket/krb5/kerberosv5.py
index d81af85904..1375091056 100644
--- a/impacket/krb5/kerberosv5.py
+++ b/impacket/krb5/kerberosv5.py
@@ -712,7 +712,7 @@ def getErrorPacket( self ):
         return self.packet
 
     def getErrorString( self ):
-        return str(self)
+        return constants.ERROR_MESSAGES[self.error]
 
     def __str__( self ):
         retString = 'Kerberos SessionError: %s(%s)' % (constants.ERROR_MESSAGES[self.error])
diff --git a/impacket/smbconnection.py b/impacket/smbconnection.py
index 58c1e51b27..bcc8031f89 100644
--- a/impacket/smbconnection.py
+++ b/impacket/smbconnection.py
@@ -986,7 +986,7 @@ def getErrorPacket( self ):
         return self.packet
 
     def getErrorString( self ):
-        return str(self)
+        return nt_errors.ERROR_MESSAGES[self.error]
 
     def __str__( self ):
         key = self.error