diff --git a/src/clox/mm.rs b/src/clox/mm.rs
index 455da9a..1c368cf 100644
--- a/src/clox/mm.rs
+++ b/src/clox/mm.rs
@@ -301,7 +301,11 @@ impl WeakRoot {
             // Slot is already taken
             return None;
         }
-        self.0.set(NonNull::new(root as *mut _));
+        self.0.set(NonNull::new(unsafe {
+            std::mem::transmute::<*const (dyn HasRoots + 'root), *mut (dyn HasRoots + 'static)>(
+                root,
+            )
+        }));
         Some(GcToken(self, PhantomData))
     }