diff --git a/client/src/cmdhfmfdes.c b/client/src/cmdhfmfdes.c
index cb3b7a603..71a48efbb 100644
--- a/client/src/cmdhfmfdes.c
+++ b/client/src/cmdhfmfdes.c
@@ -5018,7 +5018,7 @@ static int CmdHF14ADesWriteData(const char *Cmd) {
 
         if (res == PM3_SUCCESS) {
             PrintAndLogEx(INFO, _GREEN_("Commit Reader ID: "));
-            PrintAndLogEx(INFO, "Prev reader id encoded [%d]: %s", resplen, sprint_hex(resp, resplen));
+            PrintAndLogEx(INFO, "Prev reader id encoded [%zu]: %s", resplen, sprint_hex(resp, resplen));
 
             if (trkeylen > 0) {
                 uint8_t sessionkey[16] = {0};