diff --git a/src/benchmarks/Tiktoken.Benchmarks/Benchmarks.cs b/src/benchmarks/Tiktoken.Benchmarks/Benchmarks.cs
index 60c50a2..f096ccd 100644
--- a/src/benchmarks/Tiktoken.Benchmarks/Benchmarks.cs
+++ b/src/benchmarks/Tiktoken.Benchmarks/Benchmarks.cs
@@ -41,7 +41,7 @@ public async Task GlobalSetup()
     
     [Benchmark]
     [BenchmarkCategory("Encode")]
-    public IReadOnlyCollection<int> MicrosoftMLTokenizerV1_0_0_Encode() => _microsoftMlTiktoken.EncodeToIds(Data);
+    public IReadOnlyCollection<int> MicrosoftMLTokenizerV1_0_0_Encode() => _microsoftMlTiktoken.EncodeToIds(Data.AsSpan());
     
     [Benchmark]
     [BenchmarkCategory("Encode")]
@@ -62,7 +62,7 @@ public async Task GlobalSetup()
     
     [Benchmark]
     [BenchmarkCategory("CountTokens")]
-    public int MicrosoftMLTokenizerV1_0_0_() => _microsoftMlTiktoken.CountTokens(Data);
+    public int MicrosoftMLTokenizerV1_0_0_() => _microsoftMlTiktoken.CountTokens(Data.AsSpan());
     
     [Benchmark]
     [BenchmarkCategory("CountTokens")]