diff --git a/app/ceph.py b/app/ceph.py
index a921db6..6ae26fc 100644
--- a/app/ceph.py
+++ b/app/ceph.py
@@ -12,10 +12,10 @@ def ceph():
 @click.option("--ssh_username", required=True)
 def setup(ceph_url, ssh_username):
     ssh_key = ""
-    with open("~/.ssh/id_rsa.pub") as pubkey:
+    with open(os.path.expanduser("~/.ssh/id_rsa.pub")) as pubkey:
         ssh_key = pubkey.read()
     
-    with open("~/.ssh/known_hosts", "a") as known_hosts:
+    with open(os.path.expanduser("~/.ssh/known_hosts"), "a") as known_hosts:
         known_hosts.write(f"{ceph_url} {ssh_key}")
 
     os.makedirs("/etc/ceph", exist_ok=True)