diff --git a/src/Neo/Extensions/Persistence/ReadOnlyViewExtensions.cs b/src/Neo/Extensions/Persistence/ReadOnlyViewExtensions.cs
index 2495109606..d3632c6c72 100644
--- a/src/Neo/Extensions/Persistence/ReadOnlyViewExtensions.cs
+++ b/src/Neo/Extensions/Persistence/ReadOnlyViewExtensions.cs
@@ -125,7 +125,7 @@ public static class ReadOnlyViewExtensions
         /// <exception cref="ArgumentException">
         /// Thrown when <paramref name="keyPrefix"/> is all 0xff and <paramref name="maxSizeWhenAll0xff"/> is less than or equal to 0.
         /// </exception>
-        internal static byte[] GetSeekPrefix(this byte[]? keyPrefix, int maxSizeWhenAll0xff = 4096 /* make it long enough */)
+        internal static byte[] GetSeekPrefix(this byte[]? keyPrefix, ushort maxSizeWhenAll0xff = 4096 /* make it long enough */)
         {
             if (keyPrefix == null) // Backwards seek for null prefix is not supported for now.
                 throw new ArgumentNullException(nameof(keyPrefix));