diff --git a/zipl/boot/sclp.h b/zipl/boot/sclp.h
index ffee5879..2da9d8e3 100644
--- a/zipl/boot/sclp.h
+++ b/zipl/boot/sclp.h
@@ -53,19 +53,21 @@ struct gds_subvector {
 	uint8_t      key;
 } __packed;
 
+/* Structure must not have any padding */
 struct sccb_header {
 	uint16_t     length;
 	uint8_t      function_code;
 	uint8_t      control_mask[3];
 	uint16_t     response_code;
-} __packed;
+};
 
+/* Structure must not have any padding */
 struct evbuf_header {
 	uint16_t     length;
 	uint8_t      type;
 	uint8_t      flags;
 	uint16_t     _reserved;
-} __packed;
+};
 
 struct mto {
 	uint16_t length;
diff --git a/zipl/boot/sclp_stage3.h b/zipl/boot/sclp_stage3.h
index ae0c05c3..72c8a58d 100644
--- a/zipl/boot/sclp_stage3.h
+++ b/zipl/boot/sclp_stage3.h
@@ -40,10 +40,11 @@ struct sdias_evbuf {
 	uint16_t     dbs;
 } __packed;
 
+/* Structure must not have any padding */
 struct sdias_sccb {
 	struct sccb_header  header;
 	struct sdias_evbuf  evbuf;
-} __packed;
+};
 
 
 int sclp_hsa_copy(void *, unsigned long, unsigned long);
diff --git a/zipl/boot/stage3.h b/zipl/boot/stage3.h
index 3a020017..3119e619 100644
--- a/zipl/boot/stage3.h
+++ b/zipl/boot/stage3.h
@@ -124,11 +124,12 @@ struct ipl_rl_hdr {
 } __packed;
 
 /* IPL Report Block header */
+/* Structure must not have any padding */
 struct ipl_rb_hdr {
 	uint32_t len;
 	uint8_t  rbt;
 	uint8_t  reserved1[11];
-} __packed;
+};
 
 /* IPL Report Block types */
 enum ipl_rbt {
@@ -162,12 +163,13 @@ struct ipl_rb_component_entry {
 #define IPL_RB_COMPONENT_FLAG_SIGNED	0x80
 #define IPL_RB_COMPONENT_FLAG_VERIFIED	0x40
 
+/* Structure must not have any padding */
 struct ipl_rb_components {
 	uint32_t len;
 	uint8_t  rbt;
 	uint8_t  reserved1[11];
 	struct ipl_rb_component_entry entries[];
-} __packed;
+};
 
 extern unsigned long long _parm_addr;   /* address of parmline */
 extern unsigned long long _initrd_addr; /* address of initrd */