diff --git a/cli/ops/plugin.rs b/cli/ops/plugin.rs
index 775178f1eda612..e648b1919dfd20 100644
--- a/cli/ops/plugin.rs
+++ b/cli/ops/plugin.rs
@@ -105,7 +105,7 @@ impl<'a> plugin_api::Interface for PluginInterface<'a> {
   fn register_op(
     &mut self,
     name: &str,
-    dispatch_op_fn: plugin_api::DispatchOpFn,
+    dispatch_op_fn: Box<plugin_api::DispatchOpFn>,
   ) -> OpId {
     let plugin_lib = self.plugin_lib.clone();
     self.isolate_state.op_registry.register(
diff --git a/core/core_isolate.rs b/core/core_isolate.rs
index dc22d821adbc8a..04f1ab72078972 100644
--- a/core/core_isolate.rs
+++ b/core/core_isolate.rs
@@ -109,6 +109,15 @@ pub struct CoreIsolateState {
   waker: AtomicWaker,
 }
 
+impl Drop for CoreIsolateState {
+  fn drop(&mut self) {
+    // TODO(afinch7) this is a temporary fix for a segfault that occurus when
+    // dropping plugin ops. I know that the plugin Rc<Library> value gets dropped
+    // early for some reason, but still not quite sure why.
+    drop(std::mem::take(&mut self.op_registry));
+  }
+}
+
 // TODO(ry) The trait v8::InIsolate is superfluous. HandleScope::new should just
 // take &mut v8::Isolate.
 impl v8::InIsolate for CoreIsolate {
diff --git a/core/plugin_api.rs b/core/plugin_api.rs
index 16f5d4a365b6c4..b82073359731ba 100644
--- a/core/plugin_api.rs
+++ b/core/plugin_api.rs
@@ -15,8 +15,9 @@ pub use crate::ZeroCopyBuf;
 
 pub type InitFn = fn(&mut dyn Interface);
 
-pub type DispatchOpFn = fn(&mut dyn Interface, &[u8], &mut [ZeroCopyBuf]) -> Op;
+pub type DispatchOpFn =
+  dyn Fn(&mut dyn Interface, &[u8], &mut [ZeroCopyBuf]) -> Op;
 
 pub trait Interface {
-  fn register_op(&mut self, name: &str, dispatcher: DispatchOpFn) -> OpId;
+  fn register_op(&mut self, name: &str, dispatcher: Box<DispatchOpFn>) -> OpId;
 }
diff --git a/test_plugin/src/lib.rs b/test_plugin/src/lib.rs
index 781bc42594fda3..906afa34b5834a 100644
--- a/test_plugin/src/lib.rs
+++ b/test_plugin/src/lib.rs
@@ -6,8 +6,8 @@ use futures::future::FutureExt;
 
 #[no_mangle]
 pub fn deno_plugin_init(interface: &mut dyn Interface) {
-  interface.register_op("testSync", op_test_sync);
-  interface.register_op("testAsync", op_test_async);
+  interface.register_op("testSync", Box::new(op_test_sync));
+  interface.register_op("testAsync", Box::new(op_test_async));
 }
 
 fn op_test_sync(