diff --git a/DiscordChatExporter.Core/Exporting/MessageGroupTemplate.cshtml b/DiscordChatExporter.Core/Exporting/MessageGroupTemplate.cshtml
index 661bd13a..3a72cd8f 100644
--- a/DiscordChatExporter.Core/Exporting/MessageGroupTemplate.cshtml
+++ b/DiscordChatExporter.Core/Exporting/MessageGroupTemplate.cshtml
@@ -1,5 +1,6 @@
 @using System
 @using System.Collections.Generic
+@using System.Globalization
 @using System.Linq
 @using System.Threading.Tasks
 @using DiscordChatExporter.Core.Discord.Data
@@ -99,7 +100,7 @@
                         }
                         else if (message.Kind == MessageKind.Call)
                         {
-                            <span>started a call that lasted @(((message.CallEndedTimestamp ?? message.Timestamp) - message.Timestamp).TotalMinutes) minutes</span>
+                            <span>started a call that lasted @(((message.CallEndedTimestamp ?? message.Timestamp) - message.Timestamp).TotalMinutes.ToString("n0", CultureInfo.InvariantCulture)) minutes</span>
                         }
                         else if (message.Kind == MessageKind.ChannelNameChange)
                         {
diff --git a/DiscordChatExporter.Core/Exporting/PlainTextMessageExtensions.cs b/DiscordChatExporter.Core/Exporting/PlainTextMessageExtensions.cs
index 2f172457..405f3dba 100644
--- a/DiscordChatExporter.Core/Exporting/PlainTextMessageExtensions.cs
+++ b/DiscordChatExporter.Core/Exporting/PlainTextMessageExtensions.cs
@@ -1,4 +1,5 @@
-using System.Linq;
+using System.Globalization;
+using System.Linq;
 using DiscordChatExporter.Core.Discord.Data;
 using DiscordChatExporter.Core.Utils.Extensions;
 
@@ -19,7 +20,13 @@ internal static class PlainTextMessageExtensions
             : "Removed a recipient.",
 
         MessageKind.Call =>
-            $"Started a call that lasted {message.CallEndedTimestamp?.Pipe(t => t - message.Timestamp).Pipe(t => (int)t.TotalMinutes) ?? 0} minutes.",
+            $"Started a call that lasted {
+                message
+                    .CallEndedTimestamp?
+                    .Pipe(t => t - message.Timestamp)
+                    .Pipe(t => t.TotalMinutes)
+                    .ToString("n0", CultureInfo.InvariantCulture) ?? "0"
+            } minutes.",
 
         MessageKind.ChannelNameChange =>
             !string.IsNullOrWhiteSpace(message.Content)