diff --git a/uefi/CHANGELOG.md b/uefi/CHANGELOG.md
index 2fa03d39f..dc1961baa 100644
--- a/uefi/CHANGELOG.md
+++ b/uefi/CHANGELOG.md
@@ -1,6 +1,7 @@
 # uefi - [Unreleased]
 
 ## Added
+- Made memory map types `#[repr(C)]`
 
 ## Changed
 
diff --git a/uefi/src/mem/memory_map/impl_.rs b/uefi/src/mem/memory_map/impl_.rs
index b0f4c79e5..74cfb197a 100644
--- a/uefi/src/mem/memory_map/impl_.rs
+++ b/uefi/src/mem/memory_map/impl_.rs
@@ -44,6 +44,7 @@ impl core::error::Error for MemoryMapError {}
 
 /// Implementation of [`MemoryMap`] for the given buffer.
 #[derive(Debug)]
+#[repr(C)]
 pub struct MemoryMapRef<'a> {
     buf: &'a [u8],
     meta: MemoryMapMeta,
@@ -107,6 +108,7 @@ impl Index<usize> for MemoryMapRef<'_> {
 
 /// Implementation of [`MemoryMapMut`] for the given buffer.
 #[derive(Debug)]
+#[repr(C)]
 pub struct MemoryMapRefMut<'a> {
     buf: &'a mut [u8],
     meta: MemoryMapMeta,
@@ -287,6 +289,7 @@ impl IndexMut<usize> for MemoryMapRefMut<'_> {
 ///
 /// [`boot::get_memory_map`]: crate::boot::get_memory_map
 #[derive(Debug)]
+#[repr(C)]
 pub(crate) struct MemoryMapBackingMemory(NonNull<[u8]>);
 
 impl MemoryMapBackingMemory {
@@ -386,6 +389,7 @@ impl Drop for MemoryMapBackingMemory {
 
 /// Implementation of [`MemoryMapMut`] that owns the buffer on the UEFI heap.
 #[derive(Debug)]
+#[repr(C)]
 pub struct MemoryMapOwned {
     /// Backing memory, properly initialized at this point.
     pub(crate) buf: MemoryMapBackingMemory,
diff --git a/uefi/src/mem/memory_map/mod.rs b/uefi/src/mem/memory_map/mod.rs
index d32c2a253..541723bef 100644
--- a/uefi/src/mem/memory_map/mod.rs
+++ b/uefi/src/mem/memory_map/mod.rs
@@ -66,6 +66,7 @@ pub struct MemoryMapKey(pub(crate) usize);
 /// called. All following invocations (hidden, subtle, and asynchronous ones)
 /// will likely invalidate this.
 #[derive(Copy, Clone, Debug)]
+#[repr(C)]
 pub struct MemoryMapMeta {
     /// The actual size of the map.
     pub map_size: usize,