diff --git a/src/praetor/mod.rs b/src/praetor/mod.rs
index 974147a..7d38efc 100644
--- a/src/praetor/mod.rs
+++ b/src/praetor/mod.rs
@@ -1168,12 +1168,14 @@ impl WorkerThread {
     }
 
     #[allow(dead_code)]
+    #[inline(always)]
     fn current() -> Option<NonNull<WorkerThread>> {
-        WORKER.with(|ptr| unsafe { *ptr.get() })
+        unsafe { *WORKER.with(UnsafeCell::get) }
     }
 
+    #[inline(always)]
     fn current_ref<'a>() -> Option<&'a WorkerThread> {
-        WORKER.with(|ptr| unsafe { (&*ptr.get()).map(|ptr| ptr.as_ref()) })
+        unsafe { (*WORKER.with(UnsafeCell::get)).map(|ptr| ptr.as_ref()) }
     }
 
     fn push_front<T>(&self, job: &Job<T>) {
@@ -1263,6 +1265,7 @@ impl WorkerThread {
     }
 
     /// This function must be called from a worker thread.
+    #[inline]
     fn join_heartbeat<A, B, RA, RB>(&self, a: A, b: B) -> (RA, RB)
     where
         RA: Send,
@@ -1596,25 +1599,18 @@ impl<'scope> Scope<'scope> {
         A: FnOnce(&Self) -> RA + Send,
         B: FnOnce(&Self) -> RB + Send,
     {
-        #[inline(always)]
-        fn make_scope_closure<'scope, A, RA>(
-            this: SendPtr<Scope<'scope>>,
-            a: A,
-        ) -> impl FnOnce() -> RA + use<'scope, RA, A>
-        where
-            A: FnOnce(&Scope<'scope>) -> RA + Send,
-            RA: Send,
-        {
-            let scope = unsafe { this.as_ref() };
-            move || a(scope)
-        }
-
         let worker = WorkerThread::current_ref().expect("join is run in workerthread.");
         let this = SendPtr::new_const(self).unwrap();
 
         worker.join_heartbeat_every::<_, _, _, _, 64>(
-            make_scope_closure(this, a),
-            make_scope_closure(this, b),
+            {
+                let this = this;
+                move || a(unsafe { this.as_ref() })
+            },
+            {
+                let this = this;
+                move || b(unsafe { this.as_ref() })
+            },
         )
     }