diff --git a/extensions/bonjour/src/ciao.test.ts b/extensions/bonjour/src/ciao.test.ts
index 48f7726048b..252b41399e1 100644
--- a/extensions/bonjour/src/ciao.test.ts
+++ b/extensions/bonjour/src/ciao.test.ts
@@ -21,6 +21,17 @@ describe("bonjour-ciao", () => {
     });
   });
 
+  it("classifies ciao interface assertions using changed wording", () => {
+    expect(
+      classifyCiaoUnhandledRejection(
+        new Error("Reached illegal state! IPv4 address changed from undefined to defined!"),
+      ),
+    ).toEqual({
+      kind: "interface-assertion",
+      formatted: "Reached illegal state! IPv4 address changed from undefined to defined!",
+    });
+  });
+
   it("classifies ciao netmask assertions separately from side effects", () => {
     expect(
       classifyCiaoUnhandledRejection(
diff --git a/extensions/bonjour/src/ciao.ts b/extensions/bonjour/src/ciao.ts
index b5d37a502da..da623b27856 100644
--- a/extensions/bonjour/src/ciao.ts
+++ b/extensions/bonjour/src/ciao.ts
@@ -2,7 +2,7 @@ import { formatBonjourError } from "./errors.js";
 
 const CIAO_CANCELLATION_MESSAGE_RE = /^CIAO (?:ANNOUNCEMENT|PROBING) CANCELLED\b/u;
 const CIAO_INTERFACE_ASSERTION_MESSAGE_RE =
-  /REACHED ILLEGAL STATE!?\s+IPV4 ADDRESS CHANGE FROM (?:DEFINED TO UNDEFINED|UNDEFINED TO DEFINED)!?/u;
+  /REACHED ILLEGAL STATE!?\s+IPV4 ADDRESS CHANGED? FROM (?:DEFINED TO UNDEFINED|UNDEFINED TO DEFINED)!?/u;
 const CIAO_NETMASK_ASSERTION_MESSAGE_RE =
   /IP ADDRESS VERSION MUST MATCH\.\s+NETMASK CANNOT HAVE A VERSION DIFFERENT FROM THE ADDRESS!?/u;
 // Restricted sandboxes (NemoClaw, Docker-in-Docker, k3s with locked-down policy)