diff --git a/oden-js/src/callback.rs b/oden-js/src/callback.rs
index 55e7b03a..b8dc3120 100644
--- a/oden-js/src/callback.rs
+++ b/oden-js/src/callback.rs
@@ -3,9 +3,9 @@ use oden_js_sys as sys;
 use std::ffi::c_int;
 use std::panic::catch_unwind;
 
-pub trait Callback: Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> ValueResult {}
+pub trait Callback: 'static + Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> ValueResult {}
 
-impl<T> Callback for T where T: Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> ValueResult {}
+impl<T> Callback for T where T: 'static + Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> ValueResult {}
 
 struct CallbackObject<T: Callback> {
     callback: T,
diff --git a/oden-js/src/context.rs b/oden-js/src/context.rs
index 5e0f167c..8f2dd651 100644
--- a/oden-js/src/context.rs
+++ b/oden-js/src/context.rs
@@ -169,14 +169,14 @@ impl ContextRef {
     }
 
     /// Construct a new value that wraps a strongly-typed closure.
-    pub fn new_fn<F>(&self, func: impl RustFunction<F>) -> ValueResult {
-        self.new_dynamic_fn(|c, _, a| func.call(c, a))
+    pub fn new_fn<F>(&self, func: impl RustFunction<F> + 'static) -> ValueResult {
+        self.new_dynamic_fn(move |c, _, a| func.call(c, a))
     }
 
     /// Construct a new value that wraps a dynamically-typed closure.
     pub fn new_dynamic_fn<F>(&self, func: F) -> ValueResult
     where
-        F: Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> ValueResult,
+        F: 'static + Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> ValueResult,
     {
         // Constructing a new function is complicated enough that it needs to
         // be out of line.
@@ -472,7 +472,7 @@ mod tests {
             go.set_property(
                 &ctx,
                 "foo",
-                &ctx.new_dynamic_fn(|c, _, _| Ok(return_value.dup(c)))
+                &ctx.new_dynamic_fn(move |c, _, _| Ok(return_value.dup(c)))
                     .unwrap(),
             )
             .unwrap();
diff --git a/oden-js/src/value.rs b/oden-js/src/value.rs
index f8ce5ee3..87450366 100644
--- a/oden-js/src/value.rs
+++ b/oden-js/src/value.rs
@@ -270,7 +270,7 @@ impl ValueRef {
         &mut self,
         ctx: &ContextRef,
         prop: &str,
-        func: impl RustFunction<F>,
+        func: impl RustFunction<F> + 'static,
     ) -> Result<()> {
         let vr: Value = ctx.new_fn(func)?;
         self.set_property(ctx, prop, &vr)
@@ -278,7 +278,7 @@ impl ValueRef {
 
     pub fn set_dynamic_method<F>(&mut self, ctx: &ContextRef, prop: &str, func: F) -> Result<()>
     where
-        F: Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> Result<Value>,
+        F: 'static + Fn(&ContextRef, &ValueRef, &[&ValueRef]) -> Result<Value>,
     {
         let vr: Value = ctx.new_dynamic_fn(func)?;
         self.set_property(ctx, prop, &vr)