diff --git a/src/app/FTPClient.h b/src/app/FTPClient.h
index d53f9c1..ab36c02 100644
--- a/src/app/FTPClient.h
+++ b/src/app/FTPClient.h
@@ -29,8 +29,8 @@ class FTPClient : public TCPClient
     char *_username = NULL;
     char *_currentDirectory = NULL;
     char *_currentFile = NULL;
-    uint64_t _fileSentBytes = 0;
-    uint64_t _fileRecvBytes = 0;
+    size_t _fileSentBytes = 0;
+    size_t _fileRecvBytes = 0;
     boolean _waitingForDataConnection = false;
     boolean _fileIsBeeingReceived = false;
     uint64_t _actionTimeout = 0;