diff --git a/MissionAbandonedEntry.cs b/MissionAbandonedEntry.cs
index 22937c0..57fea43 100644
--- a/MissionAbandonedEntry.cs
+++ b/MissionAbandonedEntry.cs
@@ -1,10 +1,9 @@
 
 namespace EDJournal {
     public class MissionAbandonedEntry : Entry {
-        private int missionid = 0;
-        public int MissionID => missionid;
+        public ulong MissionID { get; set; }
         protected override void Initialise() {
-            missionid = JSON.Value<int?>("MissionID") ?? 0;
+            MissionID = JSON.Value<ulong?>("MissionID") ?? 0;
         }
     }
 }
diff --git a/MissionFailedEntry.cs b/MissionFailedEntry.cs
index a7d4255..f1b4f10 100644
--- a/MissionFailedEntry.cs
+++ b/MissionFailedEntry.cs
@@ -1,7 +1,7 @@
 namespace EDJournal {
     public class MissionFailedEntry : Entry {
         public string Name { get; set; }
-        public int MissionID { get; set; }
+        public ulong MissionID { get; set; }
         public int Fine { get; set; }
 
         public string HumanReadableName {
@@ -12,7 +12,7 @@
 
         protected override void Initialise() {
             Name = JSON.Value<string>("Name") ?? "";
-            MissionID = JSON.Value<int?>("MissionID") ?? 0;
+            MissionID = JSON.Value<ulong?>("MissionID") ?? 0;
             Fine = JSON.Value<int?>("Fine") ?? 0;
         }
     }