diff --git a/client/src/cmdhfmfdes.c b/client/src/cmdhfmfdes.c
index 6dab86454..f6c56253c 100644
--- a/client/src/cmdhfmfdes.c
+++ b/client/src/cmdhfmfdes.c
@@ -3344,8 +3344,7 @@ static int DesfireCreateFileParameters(
     *datalen = 1;
 
     if (isofileid > 0) {
-        data[1] = (isofileid >> 8) & 0xff;
-        data[2] = isofileid & 0xff;
+        Uint2byteToMemLe(&data[1], isofileid);
         *datalen += 2;
     }