diff --git a/Firestore/Swift/Source/Codable/Timestamp+Codable.swift b/Firestore/Swift/Source/Codable/Timestamp+Codable.swift
index 6b1103a87d2..37d9b479733 100644
--- a/Firestore/Swift/Source/Codable/Timestamp+Codable.swift
+++ b/Firestore/Swift/Source/Codable/Timestamp+Codable.swift
@@ -59,4 +59,4 @@ extension CodableTimestamp {
 }
 
 /** Extends Timestamp to conform to Codable. */
-extension FirebaseFirestore.Timestamp: FirebaseFirestore.CodableTimestamp {}
+extension FirebaseCore.Timestamp: FirebaseFirestore.CodableTimestamp {}