diff --git a/CHANGELOG.md b/CHANGELOG.md
index 620f6bd27cc..a3696a61ff5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## **[Unreleased]**
 
+- [#1161](https://github.com/wasmerio/wasmer/pull/1161) Require imported functions to be `Send`. This is a breaking change that fixes a soundness issue in the API.
 - [#1129](https://github.com/wasmerio/wasmer/pull/1129) Standard exception types for singlepass backend.
 - [#1140](https://github.com/wasmerio/wasmer/pull/1140) Use [`blake3`](https://github.com/BLAKE3-team/BLAKE3) as default hashing algorithm for caching.
 
diff --git a/lib/runtime-core/src/typed_func.rs b/lib/runtime-core/src/typed_func.rs
index 9de9d40e2e3..f0c22c31d1b 100644
--- a/lib/runtime-core/src/typed_func.rs
+++ b/lib/runtime-core/src/typed_func.rs
@@ -430,7 +430,7 @@ macro_rules! impl_traits {
             $( $x: WasmExternType, )*
             Rets: WasmTypeList,
             Trap: TrapEarly<Rets>,
-            FN: Fn(&mut vm::Ctx $( , $x )*) -> Trap + 'static,
+            FN: Fn(&mut vm::Ctx $( , $x )*) -> Trap + 'static + Send,
         {
             #[allow(non_snake_case)]
             fn to_raw(self) -> (NonNull<vm::Func>, Option<NonNull<vm::FuncEnv>>) {
@@ -545,7 +545,7 @@ macro_rules! impl_traits {
             $( $x: WasmExternType, )*
             Rets: WasmTypeList,
             Trap: TrapEarly<Rets>,
-            FN: Fn($( $x, )*) -> Trap + 'static,
+            FN: Fn($( $x, )*) -> Trap + 'static + Send,
         {
             #[allow(non_snake_case)]
             fn to_raw(self) -> (NonNull<vm::Func>, Option<NonNull<vm::FuncEnv>>) {