diff --git a/src/wayland/dmabuf/mod.rs b/src/wayland/dmabuf/mod.rs
index af8a681..7ebb0c7 100644
--- a/src/wayland/dmabuf/mod.rs
+++ b/src/wayland/dmabuf/mod.rs
@@ -186,7 +186,7 @@ where
     let log = crate::slog_or_fallback(logger).new(o!("smithay_module" => "dmabuf_handler"));
 
     let max_planes = formats.iter().map(|f| f.plane_count).max().unwrap_or(0);
-    let formats = Rc::new(formats);
+    let formats = Rc::<[Format]>::from(formats);
     let handler = Rc::new(RefCell::new(handler));
 
     trace!(
@@ -262,7 +262,7 @@ struct ParamsHandler<H: DmabufHandler> {
     pending_planes: Vec<Plane>,
     max_planes: u32,
     used: bool,
-    formats: Rc<Vec<Format>>,
+    formats: Rc<[Format]>,
     handler: Rc<RefCell<H>>,
     log: ::slog::Logger,
 }
diff --git a/src/wayland/shm/mod.rs b/src/wayland/shm/mod.rs
index 444deaa..b86e945 100644
--- a/src/wayland/shm/mod.rs
+++ b/src/wayland/shm/mod.rs
@@ -88,7 +88,7 @@ mod pool;
 /// This type is only visible as type parameter of
 /// the `Global` handle you are provided.
 pub struct ShmGlobalData {
-    formats: Rc<Vec<wl_shm::Format>>,
+    formats: Rc<[wl_shm::Format]>,
     log: ::slog::Logger,
 }
 
@@ -115,7 +115,7 @@ where
     formats.push(wl_shm::Format::Argb8888);
     formats.push(wl_shm::Format::Xrgb8888);
     let data = ShmGlobalData {
-        formats: Rc::new(formats),
+        formats: formats.into(),
         log: log.new(o!("smithay_module" => "shm_handler")),
     };