diff --git a/src/arch/aarch64.rs b/src/arch/aarch64.rs
index 58a4a64..c3547f4 100644
--- a/src/arch/aarch64.rs
+++ b/src/arch/aarch64.rs
@@ -52,6 +52,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 16;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {
diff --git a/src/arch/or1k.rs b/src/arch/or1k.rs
index b74f2b7..bb192da 100644
--- a/src/arch/or1k.rs
+++ b/src/arch/or1k.rs
@@ -47,6 +47,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 4;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {
diff --git a/src/arch/x86.rs b/src/arch/x86.rs
index 1543a03..79b2904 100644
--- a/src/arch/x86.rs
+++ b/src/arch/x86.rs
@@ -47,6 +47,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 16;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {
diff --git a/src/arch/x86_64.rs b/src/arch/x86_64.rs
index 1da7dc2..edd7255 100644
--- a/src/arch/x86_64.rs
+++ b/src/arch/x86_64.rs
@@ -52,6 +52,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 16;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {