diff --git a/oden-js/src/promise.rs b/oden-js/src/promise.rs
index 0bf846cc..8ee23b26 100644
--- a/oden-js/src/promise.rs
+++ b/oden-js/src/promise.rs
@@ -12,7 +12,7 @@ impl PromiseHandle {
     }
 }
 
-pub type PromiseResult = Box<dyn Fn(&ContextRef) -> ValueResult + Send + 'static>;
+pub type PromiseResult = Box<dyn FnOnce(&ContextRef) -> ValueResult + Send + 'static>;
 
 pub(crate) enum PromiseEvent {
     Resolved(PromiseResult),
@@ -48,7 +48,7 @@ impl Promise {
 
     pub fn resolve<T>(mut self, value: T)
     where
-        T: Fn(&ContextRef) -> ValueResult + Send + 'static,
+        T: FnOnce(&ContextRef) -> ValueResult + Send + 'static,
     {
         let _ = self
             .channel
@@ -58,7 +58,7 @@ impl Promise {
 
     pub fn reject<T>(mut self, value: T)
     where
-        T: Fn(&ContextRef) -> ValueResult + Send + 'static,
+        T: FnOnce(&ContextRef) -> ValueResult + Send + 'static,
     {
         let _ = self
             .channel