diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
index 4849c1ceb..be195448d 100644
--- a/grub-core/fs/btrfs.c
+++ b/grub-core/fs/btrfs.c
@@ -175,7 +175,7 @@ struct grub_btrfs_time
 {
   grub_int64_t sec;
   grub_uint32_t nanosec;
-} __attribute__ ((aligned (4)));
+} GRUB_PACKED;
 
 struct grub_btrfs_inode
 {
diff --git a/include/grub/efiemu/runtime.h b/include/grub/efiemu/runtime.h
index 9b6b729f4..36d2dedf4 100644
--- a/include/grub/efiemu/runtime.h
+++ b/include/grub/efiemu/runtime.h
@@ -29,7 +29,7 @@ struct grub_efiemu_ptv_rel
 
 struct efi_variable
 {
-  grub_efi_guid_t guid;
+  grub_efi_packed_guid_t guid;
   grub_uint32_t namelen;
   grub_uint32_t size;
   grub_efi_uint32_t attributes;
diff --git a/include/grub/gpt_partition.h b/include/grub/gpt_partition.h
index 1b32f6725..9668a68c3 100644
--- a/include/grub/gpt_partition.h
+++ b/include/grub/gpt_partition.h
@@ -28,7 +28,7 @@ struct grub_gpt_part_type
   grub_uint16_t data2;
   grub_uint16_t data3;
   grub_uint8_t data4[8];
-} __attribute__ ((aligned(8)));
+} GRUB_PACKED;
 typedef struct grub_gpt_part_type grub_gpt_part_type_t;
 
 #define GRUB_GPT_PARTITION_TYPE_EMPTY \