diff --git a/src/lib.rs b/src/lib.rs
index 67634173..f796b7aa 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -551,8 +551,8 @@ pub struct IntoIter<T, const N: usize, A: Allocator> {
 
 // SAFETY: IntoIter has unique ownership of its contents.  Sending (or sharing)
 // an `IntoIter<T, N>` is equivalent to sending (or sharing) a `SmallVec<T, N>`.
-unsafe impl<T, const N: usize, A: Allocator> Send for IntoIter<T, N, A> where T: Send {}
-unsafe impl<T, const N: usize, A: Allocator> Sync for IntoIter<T, N, A> where T: Sync {}
+unsafe impl<T: Send, const N: usize, A: Allocator + Send> Send for IntoIter<T, N, A> {}
+unsafe impl<T: Sync, const N: usize, A: Allocator + Sync> Sync for IntoIter<T, N, A> {}
 
 impl<T, const N: usize, A: Allocator> IntoIter<T, N, A> {
     #[inline]