diff --git a/tests/OmniSharp.Lsp.Tests/OmniSharpSemanticTokensHandlerFacts.cs b/tests/OmniSharp.Lsp.Tests/OmniSharpSemanticTokensHandlerFacts.cs
index 059e13e471..2326a0494e 100644
--- a/tests/OmniSharp.Lsp.Tests/OmniSharpSemanticTokensHandlerFacts.cs
+++ b/tests/OmniSharp.Lsp.Tests/OmniSharpSemanticTokensHandlerFacts.cs
@@ -396,6 +396,7 @@ private async Task<SemanticHighlightSpan[]> GetSemanticHighlightsAsync(string so
                             .Cast<int>()
                             .Where(value => (tokenModifiers & (1 << value)) != 0)
                             .Cast<SemanticHighlightModifier>()
+                            .ToArray()
                         : Enumerable.Empty<SemanticHighlightModifier>()
                 };