diff --git a/src/game.rs b/src/game.rs
index b036f3c3..b87be547 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -172,7 +172,7 @@ pub fn symbols() -> JsHashMap<crate::ResourceType, u32> {
 /// [Screeps documentation](http://docs.screeps.com/api/#Game.getObjectById)
 pub fn get_object_by_js_id_typed<T>(id: &JsObjectId<T>) -> Option<T>
 where
-    T: MaybeHasId,
+    T: MaybeHasId + JsCast,
 {
     Game::get_object_by_id(&id.raw).map(JsCast::unchecked_into)
 }
@@ -183,7 +183,7 @@ where
 /// [Screeps documentation](http://docs.screeps.com/api/#Game.getObjectById)
 pub fn get_object_by_id_typed<T>(id: &ObjectId<T>) -> Option<T>
 where
-    T: MaybeHasId,
+    T: MaybeHasId + JsCast,
 {
     // construct a reference to a javascript string using the id data
     let js_str = JsString::from(id.to_string());
diff --git a/src/js_collections.rs b/src/js_collections.rs
index 575b2682..5357ef9c 100644
--- a/src/js_collections.rs
+++ b/src/js_collections.rs
@@ -241,7 +241,7 @@ impl<T> JsObjectId<T> {
     /// don't have vision for.
     pub fn resolve(&self) -> Option<T>
     where
-        T: MaybeHasId,
+        T: MaybeHasId + JsCast,
     {
         game::get_object_by_js_id_typed(self)
     }
diff --git a/src/local/object_id.rs b/src/local/object_id.rs
index e4f8733d..d01021ef 100644
--- a/src/local/object_id.rs
+++ b/src/local/object_id.rs
@@ -169,7 +169,7 @@ impl<T> ObjectId<T> {
     /// we don't have vision for.
     pub fn try_resolve(self) -> Result<Option<T>, RoomObject>
     where
-        T: MaybeHasId,
+        T: MaybeHasId + JsCast,
     {
         match game::get_object_by_id_erased(&self.raw) {
             Some(v) => v.dyn_into().map(|v| Some(v)),
@@ -186,7 +186,7 @@ impl<T> ObjectId<T> {
     /// don't have vision for.
     pub fn resolve(self) -> Option<T>
     where
-        T: MaybeHasId,
+        T: MaybeHasId + JsCast,
     {
         game::get_object_by_id_typed(&self)
     }
diff --git a/src/traits.rs b/src/traits.rs
index 389756d5..6f78a242 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -86,7 +86,7 @@ pub trait HasId: MaybeHasId {
 
 /// Trait for all game objects which may (or may not) have an associated unique
 /// identifier.
-pub trait MaybeHasId: JsCast {
+pub trait MaybeHasId {
     /// Object ID of the object, which can be used to efficiently fetch a
     /// fresh reference to the object on subsequent ticks, or `None` if the
     /// object doesn't currently have an ID.
@@ -123,7 +123,7 @@ pub trait MaybeHasId: JsCast {
 
 impl<T> MaybeHasId for T
 where
-    T: HasId + JsCast,
+    T: HasId,
 {
     fn try_js_raw_id(&self) -> Option<JsString> {
         Some(self.js_raw_id())