diff --git a/include/pm3_cmd.h b/include/pm3_cmd.h
index aefc36339..97dc91e49 100644
--- a/include/pm3_cmd.h
+++ b/include/pm3_cmd.h
@@ -350,7 +350,7 @@ typedef struct {
 
 typedef struct iclass_premac {
     uint8_t mac[4];
-} iclass_premac_t;
+} PACKED iclass_premac_t;
 
 typedef struct {
     bool use_credit_key;