diff --git a/examples/fetch/Cargo.toml b/examples/fetch/Cargo.toml
index 380cceea..d90ec1ac 100644
--- a/examples/fetch/Cargo.toml
+++ b/examples/fetch/Cargo.toml
@@ -2,6 +2,7 @@
 name = "fetch"
 version = "0.1.0"
 authors = ["The wasm-bindgen Developers"]
+edition = "2018"
 
 [lib]
 crate-type = ["cdylib"]