diff --git a/fixed_wide_vectors/src/macros/matrix.rs b/fixed_wide_vectors/src/macros/matrix.rs
index 6123736..0c1c371 100644
--- a/fixed_wide_vectors/src/macros/matrix.rs
+++ b/fixed_wide_vectors/src/macros/matrix.rs
@@ -38,8 +38,9 @@ macro_rules! impl_matrix {
 			where
 				T:core::ops::Mul<U,Output=V>+Copy,
 				V:core::iter::Sum,
+				U:Clone,
 			{
-				let mut array_of_iterators=rhs.array.map(|axis|axis.into_iter());
+				let mut array_of_iterators=rhs.array.map(|axis|axis.into_iter().cycle());
 				Matrix{
 					array:self.array.map(|axis|
 						core::array::from_fn(|_|