diff --git a/src/bus.rs b/src/bus.rs
index 5c6af03..90bda82 100644
--- a/src/bus.rs
+++ b/src/bus.rs
@@ -318,6 +318,8 @@ impl<B: UsbBus> UsbBusAllocator<B> {
     }
 }
 
+unsafe impl<T> Sync for UsbBusAllocator<T> where T: Sync + UsbBus {}
+
 /// A handle for a USB interface that contains its number.
 #[derive(Copy, Clone, Eq, PartialEq)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
diff --git a/src/lib.rs b/src/lib.rs
index ad009fb..d218c9e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -289,4 +289,5 @@ fn _ensure_sync() {
     ensure_sync::<crate::endpoint::EndpointIn<DummyBus>>();
     ensure_sync::<crate::endpoint::EndpointOut<DummyBus>>();
     ensure_sync::<DummyClass<'_, DummyBus>>();
+    ensure_sync::<UsbBusAllocator<DummyBus>>();
 }