diff --git a/src/GitReleaseManager.Core/Model/Issue.cs b/src/GitReleaseManager.Core/Model/Issue.cs
index 7914672f..222d8eb9 100644
--- a/src/GitReleaseManager.Core/Model/Issue.cs
+++ b/src/GitReleaseManager.Core/Model/Issue.cs
@@ -6,7 +6,7 @@ public sealed class Issue
     {
         public string Title { get; set; }
 
-        public int InternalNumber { get; set; }
+        public long InternalNumber { get; set; }
 
         public int PublicNumber { get; set; }