diff --git a/src/praetor/mod.rs b/src/praetor/mod.rs
index 568884a..ebad441 100644
--- a/src/praetor/mod.rs
+++ b/src/praetor/mod.rs
@@ -935,6 +935,9 @@ mod job {
 
                 // turn `this`, which was allocated at (2), into box.
                 // miri complains this is a use-after-free, but it isn't? silly miri...
+                // Turns out this is actually correct on miri's end, but because
+                // we ensure that the scope lives as long as any jobs, this is
+                // actually fine, as far as I can tell.
                 let this = unsafe { Box::from_raw(this.cast::<HeapJob<F>>().cast_mut()) };
                 let f = this.into_inner();
 
@@ -948,9 +951,9 @@ mod job {
             }
 
             // (1) allocate box for job
-            Box::into_raw(Box::new(Job::new(harness::<F, T>, unsafe {
+            Box::into_raw(Box::new(Job::new(harness::<F, T>, {
                 // (2) convert self into a pointer
-                NonNull::new_unchecked(Box::into_raw(self)).cast()
+                Box::into_non_null(self).cast()
             })))
         }
     }
@@ -1436,7 +1439,10 @@ impl<'scope> Scope<'scope> {
         R: Send,
     {
         run_in_worker(|worker| {
-            let this = Self::from_context(worker.context.clone());
+            // SAFETY: we call complete() after creating this scope, which
+            // ensures that any jobs spawned from the scope exit before the
+            // scope closes.
+            let this = unsafe { Self::from_context(worker.context.clone()) };
             this.complete(worker, || f(&this))
         })
     }
@@ -1447,7 +1453,10 @@ impl<'scope> Scope<'scope> {
         R: Send,
     {
         context.run_in_worker(|worker| {
-            let this = Self::from_context(context.clone());
+            // SAFETY: we call complete() after creating this scope, which
+            // ensures that any jobs spawned from the scope exit before the
+            // scope closes.
+            let this = unsafe { Self::from_context(context.clone()) };
             this.complete(worker, || f(&this))
         })
     }
@@ -1628,7 +1637,7 @@ impl<'scope> Scope<'scope> {
         )
     }
 
-    fn from_context(ctx: Arc<Context>) -> Self {
+    unsafe fn from_context(ctx: Arc<Context>) -> Self {
         Self {
             context: ctx,
             job_counter: JobCounter::default(),