diff --git a/src/client.ts b/src/client.ts
index 9bc6ce6..c429a29 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -415,12 +415,6 @@ export class JamClient<Config extends ClientConfig = ClientConfig> {
   }
 
   static isProblemDetails(value: unknown): value is JMAP.ProblemDetails {
-    return (
-      typeof value === "object" &&
-      value !== null &&
-      "type" in value &&
-      "status" in value &&
-      "detail" in value
-    );
+    return typeof value === "object" && value !== null && "type" in value;
   }
 }
diff --git a/src/types/jmap.ts b/src/types/jmap.ts
index 53921f9..be1fd2a 100644
--- a/src/types/jmap.ts
+++ b/src/types/jmap.ts
@@ -127,8 +127,8 @@ export type ResultReference = {
  */
 export type ProblemDetails = {
   type: string;
-  status: number;
-  detail: string;
+  status?: number;
+  detail?: string;
   instance?: string;
   methodCallId?: string;
 };