diff --git a/crates/core/src/limiter.rs b/crates/core/src/limiter.rs
index 7e74b65e73..699b3bca16 100644
--- a/crates/core/src/limiter.rs
+++ b/crates/core/src/limiter.rs
@@ -164,7 +164,7 @@ pub trait ResourceLimiter {
 /// This type exists both to make types a little easier to read and to provide
 /// a `Debug` impl so that `#[derive(Debug)]` works on structs that contain it.
 #[derive(Default)]
-pub struct ResourceLimiterRef<'a>(Option<&'a mut (dyn ResourceLimiter)>);
+pub struct ResourceLimiterRef<'a>(Option<&'a mut dyn ResourceLimiter>);
 
 impl Debug for ResourceLimiterRef<'_> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
diff --git a/crates/core/src/trap.rs b/crates/core/src/trap.rs
index f15457971d..2a6580ed10 100644
--- a/crates/core/src/trap.rs
+++ b/crates/core/src/trap.rs
@@ -117,7 +117,7 @@ impl Trap {
     {
         self.reason
             .as_host()
-            .and_then(<(dyn HostError + 'static)>::downcast_ref)
+            .and_then(<dyn HostError + 'static>::downcast_ref)
     }
 
     /// Downcasts the [`Trap`] into the `T: HostError` if possible.
@@ -130,7 +130,7 @@ impl Trap {
     {
         self.reason
             .as_host_mut()
-            .and_then(<(dyn HostError + 'static)>::downcast_mut)
+            .and_then(<dyn HostError + 'static>::downcast_mut)
     }
 
     /// Consumes `self` to downcast the [`Trap`] into the `T: HostError` if possible.