diff --git a/src/Common/src/System/Marvin.cs b/src/Common/src/System/Marvin.cs
index 611fc5d51c2a..07a109f59dc9 100644
--- a/src/Common/src/System/Marvin.cs
+++ b/src/Common/src/System/Marvin.cs
@@ -110,9 +110,9 @@ private static ulong GenerateSeed()
         {
             using (RandomNumberGenerator rng = RandomNumberGenerator.Create())
             {
-                var bytes = new byte[sizeof(ulong)];
+                Span<byte> bytes = stackalloc byte[sizeof(ulong)];
                 rng.GetBytes(bytes);
-                return BitConverter.ToUInt64(bytes, 0);
+                return MemoryMarshal.Cast<byte, ulong>(bytes)[0];
             }
         }
     }