diff --git a/src/Shared/Http2cat/Http2Utilities.cs b/src/Shared/Http2cat/Http2Utilities.cs
index 0cc3a77cf3..b320850eaa 100644
--- a/src/Shared/Http2cat/Http2Utilities.cs
+++ b/src/Shared/Http2cat/Http2Utilities.cs
@@ -168,7 +168,7 @@ namespace Microsoft.AspNetCore.Http2Cat
             return asciiString;
         }
 
-        public unsafe string GetAsciiOrUTF8StringNonNullCharacters(this ReadOnlySpan<byte> span)
+        public unsafe string GetAsciiOrUTF8StringNonNullCharacters(ReadOnlySpan<byte> span)
         {
             if (span.IsEmpty)
             {