diff --git a/src/libextra/workcache.rs b/src/libextra/workcache.rs
index 4d3b5ae035edc..24ab8360e8fab 100644
--- a/src/libextra/workcache.rs
+++ b/src/libextra/workcache.rs
@@ -198,7 +198,6 @@ impl Database {
     }
 }
 
-// FIXME #4330: use &mut self here
 #[unsafe_destructor]
 impl Drop for Database {
     fn drop(&mut self) {
diff --git a/src/libstd/rt/rc.rs b/src/libstd/rt/rc.rs
index 0a6890f627bbb..2ba00c3a2fbac 100644
--- a/src/libstd/rt/rc.rs
+++ b/src/libstd/rt/rc.rs
@@ -78,17 +78,14 @@ impl<T> Drop for RC<T> {
         assert!(self.refcount() > 0);
 
         unsafe {
-            // FIXME(#4330) Need self by value to get mutability.
-            let this: &mut RC<T> = cast::transmute_mut(self);
-
-            match *this.get_mut_state() {
+            match *self.get_mut_state() {
                 (ref mut count, _) => {
                     *count = *count - 1
                 }
             }
 
-            if this.refcount() == 0 {
-                let _: ~(uint, T) = cast::transmute(this.p);
+            if self.refcount() == 0 {
+                let _: ~(uint, T) = cast::transmute(self.p);
             }
         }
     }
diff --git a/src/libstd/rt/uv/uvio.rs b/src/libstd/rt/uv/uvio.rs
index f3b97441e8e25..8c827430f2552 100644
--- a/src/libstd/rt/uv/uvio.rs
+++ b/src/libstd/rt/uv/uvio.rs
@@ -188,11 +188,7 @@ impl UvEventLoop {
 
 impl Drop for UvEventLoop {
     fn drop(&mut self) {
-        // XXX: Need mutable finalizer
-        let this = unsafe {
-            transmute::<&UvEventLoop, &mut UvEventLoop>(self)
-        };
-        this.uvio.uv_loop().close();
+        self.uvio.uv_loop().close();
     }
 }
 
@@ -648,9 +644,7 @@ impl UvTcpListener {
 
 impl Drop for UvTcpListener {
     fn drop(&mut self) {
-        // XXX need mutable finalizer
-        let self_ = unsafe { transmute::<&UvTcpListener, &mut UvTcpListener>(self) };
-        do self_.home_for_io_with_sched |self_, scheduler| {
+        do self.home_for_io_with_sched |self_, scheduler| {
             do scheduler.deschedule_running_task_and_then |_, task| {
                 let task = Cell::new(task);
                 do self_.watcher.as_stream().close {
@@ -763,9 +757,7 @@ impl HomingIO for UvTcpStream {
 
 impl Drop for UvTcpStream {
     fn drop(&mut self) {
-        // XXX need mutable finalizer
-        let this = unsafe { transmute::<&UvTcpStream, &mut UvTcpStream>(self) };
-        do this.home_for_io_with_sched |self_, scheduler| {
+        do self.home_for_io_with_sched |self_, scheduler| {
             do scheduler.deschedule_running_task_and_then |_, task| {
                 let task_cell = Cell::new(task);
                 do self_.watcher.as_stream().close {
@@ -922,9 +914,7 @@ impl HomingIO for UvUdpSocket {
 
 impl Drop for UvUdpSocket {
     fn drop(&mut self) {
-        // XXX need mutable finalizer
-        let this = unsafe { transmute::<&UvUdpSocket, &mut UvUdpSocket>(self) };
-        do this.home_for_io_with_sched |self_, scheduler| {
+        do self.home_for_io_with_sched |self_, scheduler| {
             do scheduler.deschedule_running_task_and_then |_, task| {
                 let task_cell = Cell::new(task);
                 do self_.watcher.close {
diff --git a/src/libstd/unstable/atomics.rs b/src/libstd/unstable/atomics.rs
index a32b52db1cc0a..e8835462a80e2 100644
--- a/src/libstd/unstable/atomics.rs
+++ b/src/libstd/unstable/atomics.rs
@@ -339,13 +339,7 @@ impl<T> AtomicOption<T> {
 #[unsafe_destructor]
 impl<T> Drop for AtomicOption<T> {
     fn drop(&mut self) {
-        // This will ensure that the contained data is
-        // destroyed, unless it's null.
-        unsafe {
-            // FIXME(#4330) Need self by value to get mutability.
-            let this : &mut AtomicOption<T> = cast::transmute(self);
-            let _ = this.take(SeqCst);
-        }
+        let _ = self.take(SeqCst);
     }
 }