diff --git a/src/geometry/transform.rs b/src/geometry/transform.rs
index d3cac9468..def063ab7 100755
--- a/src/geometry/transform.rs
+++ b/src/geometry/transform.rs
@@ -157,6 +157,7 @@ super_tcategory_impl!(
 /// It is stored as a matrix with dimensions `(D + 1, D + 1)`, e.g., it stores a 4x4 matrix for a
 /// 3D transformation.
 #[repr(C)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct Transform<T: RealField, C: TCategory, const D: usize>
 where
     Const<D>: DimNameAdd<U1>,