diff --git a/block/src/vhdx/vhdx_header.rs b/block/src/vhdx/vhdx_header.rs
index e7863d0da..bed5418d8 100644
--- a/block/src/vhdx/vhdx_header.rs
+++ b/block/src/vhdx/vhdx_header.rs
@@ -110,7 +110,7 @@ impl FileTypeIdentifier {
     }
 }
 
-#[repr(packed)]
+#[repr(C, packed)]
 #[derive(Clone, Copy, Debug)]
 pub struct Header {
     pub signature: u32,
@@ -203,7 +203,7 @@ impl Header {
     }
 }
 
-#[repr(packed)]
+#[repr(C, packed)]
 #[derive(Clone, Copy, Debug)]
 struct RegionTableHeader {
     pub signature: u32,
@@ -328,7 +328,7 @@ impl RegionInfo {
     }
 }
 
-#[repr(packed)]
+#[repr(C, packed)]
 #[derive(Clone, Copy, Debug)]
 pub struct RegionTableEntry {
     pub guid: Uuid,
diff --git a/block/src/vhdx/vhdx_metadata.rs b/block/src/vhdx/vhdx_metadata.rs
index 6284a9a5b..47cc2ff68 100644
--- a/block/src/vhdx/vhdx_metadata.rs
+++ b/block/src/vhdx/vhdx_metadata.rs
@@ -267,7 +267,7 @@ impl DiskSpec {
     }
 }
 
-#[repr(packed)]
+#[repr(C, packed)]
 #[derive(Default, Debug, Clone, Copy)]
 struct MetadataTableHeader {
     signature: u64,
@@ -298,7 +298,7 @@ impl MetadataTableHeader {
     }
 }
 
-#[repr(packed)]
+#[repr(C, packed)]
 #[derive(Default, Debug, Clone, Copy)]
 pub struct MetadataTableEntry {
     item_id: Uuid,