diff --git a/Sources/SolanaSwift/Extensions/Data+Extensions.swift b/Sources/SolanaSwift/Extensions/Data+Extensions.swift
index a560396e3..f7dd41221 100644
--- a/Sources/SolanaSwift/Extensions/Data+Extensions.swift
+++ b/Sources/SolanaSwift/Extensions/Data+Extensions.swift
@@ -18,12 +18,12 @@ public extension Data {
     }
 
     mutating func decodeLength() -> Int {
-        var len: UInt8 = 0
-        var size: UInt8 = 0
+        var len: Int = 0
+        var size: Int = 0
         while true {
             guard let elem = bytes.first else { break }
             _ = popFirst()
-            len |= (elem & 0x7F) << (size * 7)
+            len |= (Int(elem) & 0x7F) << (size * 7)
             size += 1
             if elem & 0x80 == 0 {
                 break