diff --git a/src/Microsoft.Blazor/RenderTree/RenderTreeDiffComputer.cs b/src/Microsoft.Blazor/RenderTree/RenderTreeDiffComputer.cs
index 9207d182fa..d66eadd7a4 100644
--- a/src/Microsoft.Blazor/RenderTree/RenderTreeDiffComputer.cs
+++ b/src/Microsoft.Blazor/RenderTree/RenderTreeDiffComputer.cs
@@ -176,14 +176,11 @@ namespace Microsoft.Blazor.RenderTree
                     {
                         var oldText = oldTree[oldNodeIndex].TextContent;
                         var newText = newTree[newNodeIndex].TextContent;
-                        if (string.Equals(oldText, newText, StringComparison.Ordinal))
-                        {
-                            siblingIndex++;
-                        }
-                        else
+                        if (!string.Equals(oldText, newText, StringComparison.Ordinal))
                         {
                             Append(RenderTreeEdit.UpdateText(siblingIndex, newNodeIndex));
                         }
+                        siblingIndex++;
                         break;
                     }
 
diff --git a/test/Microsoft.Blazor.Test/RenderTreeDiffComputerTest.cs b/test/Microsoft.Blazor.Test/RenderTreeDiffComputerTest.cs
index 06939a9fa7..556155fe9f 100644
--- a/test/Microsoft.Blazor.Test/RenderTreeDiffComputerTest.cs
+++ b/test/Microsoft.Blazor.Test/RenderTreeDiffComputerTest.cs
@@ -279,8 +279,10 @@ namespace Microsoft.Blazor.Test
             var oldTree = new RenderTreeBuilder(new FakeRenderer());
             var newTree = new RenderTreeBuilder(new FakeRenderer());
             var diff = new RenderTreeDiffComputer();
-            oldTree.AddText(123, "old text");
-            newTree.AddText(123, "new text");
+            oldTree.AddText(123, "old text 1");
+            oldTree.AddText(182, "old text 2");
+            newTree.AddText(123, "new text 1");
+            newTree.AddText(182, "new text 2");
 
             // Act
             var result = diff.ComputeDifference(oldTree.GetNodes(), newTree.GetNodes());
@@ -291,6 +293,11 @@ namespace Microsoft.Blazor.Test
                 {
                     AssertEdit(entry, RenderTreeEditType.UpdateText, 0);
                     Assert.Equal(0, entry.NewTreeIndex);
+                },
+                entry =>
+                {
+                    AssertEdit(entry, RenderTreeEditType.UpdateText, 1);
+                    Assert.Equal(1, entry.NewTreeIndex);
                 });
         }