diff --git a/nixosModules/clanCore/zerotier/generate.py b/nixosModules/clanCore/zerotier/generate.py
index 8f6125017..1b1e1b91f 100644
--- a/nixosModules/clanCore/zerotier/generate.py
+++ b/nixosModules/clanCore/zerotier/generate.py
@@ -55,9 +55,9 @@ class Identity:
 
     def node_id(self) -> str:
         nid = self.public.split(":")[0]
-        assert len(nid) == 10, (
-            f"node_id must be 10 characters long, got {len(nid)}: {nid}"
-        )
+        assert (
+            len(nid) == 10
+        ), f"node_id must be 10 characters long, got {len(nid)}: {nid}"
         return nid
 
 
@@ -172,9 +172,9 @@ def create_identity() -> Identity:
 
 
 def compute_zerotier_ip(network_id: str, identity: Identity) -> ipaddress.IPv6Address:
-    assert len(network_id) == 16, (
-        "network_id must be 16 characters long, got {network_id}"
-    )
+    assert (
+        len(network_id) == 16
+    ), f"network_id must be 16 characters long, got '{network_id}'"
     nwid = int(network_id, 16)
     node_id = int(identity.node_id(), 16)
     addr_parts = bytearray(