diff --git a/src/std/wrapped_origin.rs b/src/std/wrapped_origin.rs
index a547388..2d26af6 100644
--- a/src/std/wrapped_origin.rs
+++ b/src/std/wrapped_origin.rs
@@ -13,8 +13,10 @@ pub fn wrapped_origin<'a, Ctx: 'a + Context, A: Mentionable<'a, Ctx>>(
 pub trait MappableOrigin<'a, Ctx: 'a + Context>: Origin<'a, Ctx> {
     fn map<B: Mentionable<'a, Ctx>>(
         self: Rc<Self>,
-        map_ok: impl 'a + Clone + Fn(Rc<Self::Mtbl>) -> B,
+        map_ok: impl 'a + Send + Sync + Clone + Fn(Rc<Self::Mtbl>) -> B,
         map_err: impl 'a
+            + Send
+            + Sync
             + Clone
             + Fn(
                 <<Self::Mtbl as Mentionable<'a, Ctx>>::Fctr as Factory<'a, Ctx>>::ParseError,
@@ -26,8 +28,10 @@ pub trait MappableOrigin<'a, Ctx: 'a + Context>: Origin<'a, Ctx> {
 impl<'a, Ctx: 'a + Context, O: ?Sized + Origin<'a, Ctx>> MappableOrigin<'a, Ctx> for O {
     fn map<B: Mentionable<'a, Ctx>>(
         self: Rc<Self>,
-        map_ok: impl 'a + Clone + Fn(Rc<Self::Mtbl>) -> B,
+        map_ok: impl 'a + Send + Sync + Clone + Fn(Rc<Self::Mtbl>) -> B,
         map_err: impl 'a
+            + Send
+            + Sync
             + Clone
             + Fn(
                 <<Self::Mtbl as Mentionable<'a, Ctx>>::Fctr as Factory<'a, Ctx>>::ParseError,