diff --git a/src/facebook.ts b/src/facebook.ts
index 6ba70b9..1ee545d 100644
--- a/src/facebook.ts
+++ b/src/facebook.ts
@@ -24,7 +24,7 @@ interface Cookie {
 	sameSite?: "strict" | "lax" | "none" | "unspecified";
 	session?: boolean;
 	expirationDate?: number;
-	partitionKey?: any;
+	partitionKey?: Record<string, unknown>;
 	storeId?: string;
 }