diff --git a/client/src/cmdhfmf.c b/client/src/cmdhfmf.c
index de5031652..b8671c4b1 100644
--- a/client/src/cmdhfmf.c
+++ b/client/src/cmdhfmf.c
@@ -2793,7 +2793,7 @@ static int CmdHF14AMfChk_fast(const char *Cmd) {
 
     int fnlen = 0;
     char filename[FILE_PATH_SIZE] = {0};
-    CLIParamStrToBuf(arg_get_str(ctx, 14), (uint8_t *)filename, FILE_PATH_SIZE, &fnlen);
+    CLIParamStrToBuf(arg_get_str(ctx, 9), (uint8_t *)filename, FILE_PATH_SIZE, &fnlen);
 
     CLIParserFree(ctx);