diff --git a/apps/common/utils.py b/apps/common/utils.py
index 2a70fab09..214fc72be 100644
--- a/apps/common/utils.py
+++ b/apps/common/utils.py
@@ -180,15 +180,14 @@ def timesince(dt, since='', default="just now"):
 
 
 def ssh_key_string_to_obj(text):
-    key_f = StringIO(text)
     key = None
     try:
-        key = paramiko.RSAKey.from_private_key(key_f)
+        key = paramiko.RSAKey.from_private_key( StringIO(text) )
     except paramiko.SSHException:
         pass
 
     try:
-        key = paramiko.DSSKey.from_private_key(key_f)
+        key = paramiko.DSSKey.from_private_key( StringIO(text) )
     except paramiko.SSHException:
         pass
     return key
@@ -375,4 +374,4 @@ def sum_capacity(cap_list):
     return capacity_convert(total, expect='auto')
 
 
-signer = Signer()
\ No newline at end of file
+signer = Signer()