diff --git a/src/HexManiac.Core/Models/Runs/ArrayRunElementSegment.cs b/src/HexManiac.Core/Models/Runs/ArrayRunElementSegment.cs
index 8c2395e9..9d240aef 100644
--- a/src/HexManiac.Core/Models/Runs/ArrayRunElementSegment.cs
+++ b/src/HexManiac.Core/Models/Runs/ArrayRunElementSegment.cs
@@ -509,9 +509,17 @@ namespace HavenSoft.HexManiac.Core.Models.Runs {
          var result = new StringBuilder("-");
          var options = rawData.GetBitOptions(SourceArrayName);
 
+         // handle edge cases: no options, or no options for some set bits
+         var highestByteSet = Length - 1;
+         while (rawData[offset + highestByteSet] == 0 && highestByteSet > 0) {
+            highestByteSet -= 1;
+         }
+         var highestBitSet = (int)Math.Log(rawData[offset + highestByteSet], 2);
+         var unknownBitsAreSet = options == null || (highestByteSet * 8) + highestBitSet >= options.Count;
+
          for (int i = 0; i < Length; i++) {
             var bits = rawData[offset + i];
-            if (options == null) {
+            if (unknownBitsAreSet) {
                result.Append(bits.ToString("X2"));
             } else {
                var optionOffset = i << 3;
diff --git a/src/HexManiac.Tests/Before_Baseclass/ArrayRunTests.cs b/src/HexManiac.Tests/Before_Baseclass/ArrayRunTests.cs
index 84ca3961..fdb72679 100644
--- a/src/HexManiac.Tests/Before_Baseclass/ArrayRunTests.cs
+++ b/src/HexManiac.Tests/Before_Baseclass/ArrayRunTests.cs
@@ -1091,6 +1091,21 @@ namespace HavenSoft.HexManiac.Tests {
          Assert.True(match);
       }
 
+      [Fact]
+      public void BitFieldWithUnknownBitSet_CopyPaste_CorrectBitsSet() {
+         var fileSystem = new StubFileSystem();
+         Model.SetList(new ModelDelta(), "bits", "adam", "bob", "carl", "dave");
+         ViewPort.Edit("^table[a|b[]bits]3 00 10 ");
+
+         ViewPort.SelectionStart = new Point(1, 0);
+         ViewPort.Copy.Execute(fileSystem);
+
+         ViewPort.SelectionStart = new Point(2, 0);
+         ViewPort.Edit(fileSystem.CopyText);
+
+         Assert.Equal(0x10, Model[2]);
+      }
+
       private static void StandardSetup(out byte[] data, out PokemonModel model, out ViewPort viewPort) {
          data = new byte[0x200];
          model = new PokemonModel(data);