diff --git a/Sources/Citadel/SFTP/Client/SFTPFile.swift b/Sources/Citadel/SFTP/Client/SFTPFile.swift
index eefe35e..bbca13d 100644
--- a/Sources/Citadel/SFTP/Client/SFTPFile.swift
+++ b/Sources/Citadel/SFTP/Client/SFTPFile.swift
@@ -111,7 +111,7 @@ public final class SFTPFile {
                         length: UInt32(consumed)
                     )
                     
-                    readableBytes -= data.readableBytes
+                    readableBytes -= UInt64(data.readableBytes)
                     buffer.writeBuffer(&data)
                 }
             } else {