diff --git a/src/rect.rs b/src/rect.rs
index a99f97d..ce472fe 100644
--- a/src/rect.rs
+++ b/src/rect.rs
@@ -24,6 +24,7 @@ use std::hash::{Hash, Hasher};
 use std::ops::{Add, Sub, Mul, Div};
 
 /// A 2d Rectangle optionally tagged with a unit.
+#[repr(C)]
 pub struct TypedRect<T, U = UnknownUnit> {
     pub origin: TypedPoint2D<T, U>,
     pub size: TypedSize2D<T, U>,