diff --git a/aurweb/util.py b/aurweb/util.py
index 7050b482..3410e4d8 100644
--- a/aurweb/util.py
+++ b/aurweb/util.py
@@ -192,9 +192,9 @@ def parse_ssh_key(string: str) -> Tuple[str, str]:
     return prefix, key
 
 
-def parse_ssh_keys(string: str) -> list[Tuple[str, str]]:
+def parse_ssh_keys(string: str) -> set[Tuple[str, str]]:
     """Parse a list of SSH public keys."""
-    return [parse_ssh_key(e) for e in string.strip().splitlines(True) if e.strip()]
+    return set([parse_ssh_key(e) for e in string.strip().splitlines(True) if e.strip()])
 
 
 def shell_exec(cmdline: str, cwd: str) -> Tuple[int, str, str]:
diff --git a/test/test_accounts_routes.py b/test/test_accounts_routes.py
index d3ddb174..c9d77c1f 100644
--- a/test/test_accounts_routes.py
+++ b/test/test_accounts_routes.py
@@ -644,6 +644,18 @@ def test_post_register_with_ssh_pubkey(client: TestClient):
 
     assert response.status_code == int(HTTPStatus.OK)
 
+    # Let's create another user accidentally pasting their key twice
+    with db.begin():
+        db.query(SSHPubKey).delete()
+
+    pk_double = pk + "\n" + pk
+    with client as request:
+        response = post_register(
+            request, U="doubleKey", E="doubleKey@email.org", PK=pk_double
+        )
+
+    assert response.status_code == int(HTTPStatus.OK)
+
 
 def test_get_account_edit_tu_as_tu(client: TestClient, tu_user: User):
     """Test edit get route of another TU as a TU."""
@@ -1082,6 +1094,19 @@ def test_post_account_edit_ssh_pub_key(client: TestClient, user: User):
 
     assert response.status_code == int(HTTPStatus.OK)
 
+    # Accidentally enter the same key twice
+    pk = make_ssh_pubkey()
+    post_data["PK"] = pk + "\n" + pk
+
+    with client as request:
+        request.cookies = {"AURSID": sid}
+        response = request.post(
+            "/account/test/edit",
+            data=post_data,
+        )
+
+    assert response.status_code == int(HTTPStatus.OK)
+
 
 def test_post_account_edit_missing_ssh_pubkey(client: TestClient, user: User):
     request = Request()