diff --git a/SabreTools.DatFiles.Test/ItemDictionaryDBTests.cs b/SabreTools.DatFiles.Test/ItemDictionaryDBTests.cs
index a9dc7cb5..8dcd1197 100644
--- a/SabreTools.DatFiles.Test/ItemDictionaryDBTests.cs
+++ b/SabreTools.DatFiles.Test/ItemDictionaryDBTests.cs
@@ -801,7 +801,7 @@ namespace SabreTools.DatFiles.Test
             _ = dict.AddItem(item, machineIndex, sourceIndex, statsOnly: false);
 
             Assert.Equal(1, dict.DatStatistics.TotalCount);
-            Assert.Equal(1, dict.DatStatistics.ItemCounts[ItemType.Rom]);
+            Assert.Equal(1, dict.DatStatistics.GetItemCount(ItemType.Rom));
             Assert.Equal(12345, dict.DatStatistics.TotalSize);
             Assert.Equal(1, dict.DatStatistics.HashCounts[HashType.CRC32]);
             Assert.Equal(0, dict.DatStatistics.HashCounts[HashType.MD5]);
@@ -811,7 +811,7 @@ namespace SabreTools.DatFiles.Test
             dict.RecalculateStats();
 
             Assert.Equal(1, dict.DatStatistics.TotalCount);
-            Assert.Equal(1, dict.DatStatistics.ItemCounts[ItemType.Rom]);
+            Assert.Equal(1, dict.DatStatistics.GetItemCount(ItemType.Rom));
             Assert.Equal(12345, dict.DatStatistics.TotalSize);
             Assert.Equal(1, dict.DatStatistics.HashCounts[HashType.CRC32]);
             Assert.Equal(1, dict.DatStatistics.HashCounts[HashType.MD5]);
diff --git a/SabreTools.DatFiles.Test/ItemDictionaryTests.cs b/SabreTools.DatFiles.Test/ItemDictionaryTests.cs
index e73ff4e0..48be92bb 100644
--- a/SabreTools.DatFiles.Test/ItemDictionaryTests.cs
+++ b/SabreTools.DatFiles.Test/ItemDictionaryTests.cs
@@ -638,7 +638,7 @@ namespace SabreTools.DatFiles.Test
             _ = dict.AddItem(item, statsOnly: false);
 
             Assert.Equal(1, dict.DatStatistics.TotalCount);
-            Assert.Equal(1, dict.DatStatistics.ItemCounts[ItemType.Rom]);
+            Assert.Equal(1, dict.DatStatistics.GetItemCount(ItemType.Rom));
             Assert.Equal(12345, dict.DatStatistics.TotalSize);
             Assert.Equal(1, dict.DatStatistics.HashCounts[HashType.CRC32]);
             Assert.Equal(0, dict.DatStatistics.HashCounts[HashType.MD5]);
@@ -648,7 +648,7 @@ namespace SabreTools.DatFiles.Test
             dict.RecalculateStats();
 
             Assert.Equal(1, dict.DatStatistics.TotalCount);
-            Assert.Equal(1, dict.DatStatistics.ItemCounts[ItemType.Rom]);
+            Assert.Equal(1, dict.DatStatistics.GetItemCount(ItemType.Rom));
             Assert.Equal(12345, dict.DatStatistics.TotalSize);
             Assert.Equal(1, dict.DatStatistics.HashCounts[HashType.CRC32]);
             Assert.Equal(1, dict.DatStatistics.HashCounts[HashType.MD5]);
diff --git a/SabreTools.DatFiles/DatStatistics.cs b/SabreTools.DatFiles/DatStatistics.cs
index 771c197c..38873ce4 100644
--- a/SabreTools.DatFiles/DatStatistics.cs
+++ b/SabreTools.DatFiles/DatStatistics.cs
@@ -13,6 +13,11 @@ namespace SabreTools.DatFiles
     {
         #region Private instance variables
 
+        /// <summary>
+        /// Number of items for each item type
+        /// </summary>
+        private readonly Dictionary<ItemType, long> _itemCounts = [];
+
         /// <summary>
         /// Lock for statistics calculation
         /// </summary>
@@ -27,11 +32,6 @@ namespace SabreTools.DatFiles
         /// </summary>
         public long TotalCount { get; private set; } = 0;
 
-        /// <summary>
-        /// Number of items for each item type
-        /// </summary>
-        public Dictionary<ItemType, long> ItemCounts { get; } = [];
-
         /// <summary>
         /// Number of machines
         /// </summary>
@@ -173,7 +173,7 @@ namespace SabreTools.DatFiles
             TotalCount += stats.TotalCount;
 
             // Loop through and add stats for all items
-            foreach (var itemCountKvp in stats.ItemCounts)
+            foreach (var itemCountKvp in stats._itemCounts)
             {
                 AddItemCount(itemCountKvp.Key, itemCountKvp.Value);
             }
@@ -220,12 +220,12 @@ namespace SabreTools.DatFiles
         /// <returns>The number of items of that type, if it exists</returns>
         public long GetItemCount(ItemType itemType)
         {
-            lock (ItemCounts)
+            lock (_itemCounts)
             {
-                if (!ItemCounts.ContainsKey(itemType))
+                if (!_itemCounts.ContainsKey(itemType))
                     return 0;
 
-                return ItemCounts[itemType];
+                return _itemCounts[itemType];
             }
         }
 
@@ -270,14 +270,14 @@ namespace SabreTools.DatFiles
         /// <param name="interval">Amount to increment by, defaults to 1</param>
         private void AddItemCount(ItemType itemType, long interval = 1)
         {
-            lock (ItemCounts)
+            lock (_itemCounts)
             {
-                if (!ItemCounts.ContainsKey(itemType))
-                    ItemCounts[itemType] = 0;
+                if (!_itemCounts.ContainsKey(itemType))
+                    _itemCounts[itemType] = 0;
 
-                ItemCounts[itemType] += interval;
-                if (ItemCounts[itemType] < 0)
-                    ItemCounts[itemType] = 0;
+                _itemCounts[itemType] += interval;
+                if (_itemCounts[itemType] < 0)
+                    _itemCounts[itemType] = 0;
             }
         }
 
@@ -372,7 +372,7 @@ namespace SabreTools.DatFiles
         public void ResetStatistics()
         {
             TotalCount = 0;
-            ItemCounts.Clear();
+            _itemCounts.Clear();
             GameCount = 0;
             TotalSize = 0;
             HashCounts.Clear();
@@ -405,14 +405,14 @@ namespace SabreTools.DatFiles
         /// <param name="interval">Amount to increment by, defaults to 1</param>
         private void RemoveItemCount(ItemType itemType, long interval = 1)
         {
-            lock (ItemCounts)
+            lock (_itemCounts)
             {
-                if (!ItemCounts.ContainsKey(itemType))
+                if (!_itemCounts.ContainsKey(itemType))
                     return;
 
-                ItemCounts[itemType] -= interval;
-                if (ItemCounts[itemType] < 0)
-                    ItemCounts[itemType] = 0;
+                _itemCounts[itemType] -= interval;
+                if (_itemCounts[itemType] < 0)
+                    _itemCounts[itemType] = 0;
             }
         }