diff --git a/Sources/SatsPrice/ContentView.swift b/Sources/SatsPrice/ContentView.swift
index 5e0a8ad..fe047c0 100644
--- a/Sources/SatsPrice/ContentView.swift
+++ b/Sources/SatsPrice/ContentView.swift
@@ -66,8 +66,8 @@ public struct ContentView: View {
             } header: {
                 Text("1 BTC to USD")
             } footer: {
-                if priceSource != .manual {
-                    Text("Last updated: \(dateFormatter.string(from: satsViewModel.lastUpdated))")
+                if priceSource != .manual, let lastUpdated = satsViewModel.lastUpdated {
+                    Text("Last updated: \(dateFormatter.string(from: lastUpdated))")
                 }
             }
 
@@ -102,6 +102,7 @@ public struct ContentView: View {
             await updatePrice()
         }
         .onChange(of: priceSource) { newPriceSource in
+            satsViewModel.lastUpdated = nil
             priceFetcherDelegator.priceSource = newPriceSource
             Task {
                 await updatePrice()
diff --git a/Sources/SatsPrice/SatsViewModel.swift b/Sources/SatsPrice/SatsViewModel.swift
index c4a1ea2..13a0cf7 100644
--- a/Sources/SatsPrice/SatsViewModel.swift
+++ b/Sources/SatsPrice/SatsViewModel.swift
@@ -13,7 +13,7 @@ import Foundation
 import SwiftUI
 
 class SatsViewModel: ObservableObject {
-    @Published var lastUpdated: Date = Date.now
+    @Published var lastUpdated: Date?
 
     @Published var btcToUsdStringInternal: String = ""
     @Published var satsStringInternal: String = ""