diff --git a/openssh_wrapper.py b/openssh_wrapper.py
index 741da66..a421017 100644
--- a/openssh_wrapper.py
+++ b/openssh_wrapper.py
@@ -369,7 +369,7 @@ def scp_command(self, files, target):
         if self.identity_file:
             cmd += ['-i', self.identity_file]
         if self.port:
-            cmd += ['-P', self.port]
+            cmd += ['-P', str(self.port)]
 
         if isinstance(files, (text, bytes)):
             raise ValueError('"files" argument have to be iterable (list or tuple)')