diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8047c8f4c9a..41c7a1d46ed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,10 @@
 
 ## **[Unreleased]**
 
+- [#1700](https://github.com/wasmerio/wasmer/pull/1700) Implement `wasm_externtype_copy` in the Wasm C API.
+
 ## 1.0.0-alpha4 - 2020-10-08
+
 - [#1691](https://github.com/wasmerio/wasmer/pull/1691) Bump minimum supported Rust version to 1.46.0
 - [#1690](https://github.com/wasmerio/wasmer/pull/1690) Fix `wasm_memorytype_limits` where `min` and `max` represents pages, not bytes. Additionally, fixes the max limit sentinel value.
 - [#1682](https://github.com/wasmerio/wasmer/pull/1682) Improve error reporting when making a memory with invalid settings.
@@ -14,15 +17,18 @@
 - [#1645](https://github.com/wasmerio/wasmer/pull/1645) Move the install script to https://github.com/wasmerio/wasmer-install
 
 ## 1.0.0-alpha3 - 2020-09-14
+
 - [#1620](https://github.com/wasmerio/wasmer/pull/1620) Fix bug causing the Wapm binary to not be packaged with the release
 - [#1619](https://github.com/wasmerio/wasmer/pull/1619) Improve error message in engine-native when C compiler is missing
 
 ## 1.0.0-alpha02.0 - 2020-09-11
+
 - [#1602](https://github.com/wasmerio/wasmer/pull/1602) Fix panic when calling host functions with negative numbers in certain situations
 - [#1590](https://github.com/wasmerio/wasmer/pull/1590) Fix soundness issue in API of vm::Global
 - [#1566](https://github.com/wasmerio/wasmer/pull/1566) Add support for opening special Unix files to the WASI FS
 
 ## TODO: 1.0.0-alpha01.0
+
 - Wasmer refactor lands
 
 ## TODO: 17...
diff --git a/lib/c-api/src/wasm_c_api/types/extern_.rs b/lib/c-api/src/wasm_c_api/types/extern_.rs
index 97692de73fb..3f78ad11f9a 100644
--- a/lib/c-api/src/wasm_c_api/types/extern_.rs
+++ b/lib/c-api/src/wasm_c_api/types/extern_.rs
@@ -21,6 +21,15 @@ pub unsafe extern "C" fn wasm_extern_type(e: &wasm_extern_t) -> Box<wasm_externt
 #[no_mangle]
 pub unsafe extern "C" fn wasm_externtype_delete(_et: Option<Box<wasm_externtype_t>>) {}
 
+#[no_mangle]
+pub extern "C" fn wasm_externtype_copy(
+    wasm_externtype: &wasm_externtype_t,
+) -> Box<wasm_externtype_t> {
+    Box::new(wasm_externtype_t {
+        inner: wasm_externtype.inner.clone(),
+    })
+}
+
 impl From<ExternType> for wasm_externtype_t {
     fn from(other: ExternType) -> Self {
         Self { inner: other }