diff --git a/src/bindgen.rs b/src/bindgen.rs
index 68e9b606..296e4ab3 100644
--- a/src/bindgen.rs
+++ b/src/bindgen.rs
@@ -1,6 +1,7 @@
 //! Functionality related to installing and running `wasm-bindgen`.
 
 use binaries::{self, bin_path, install_binaries_from_targz_at_url};
+use cargo_metadata;
 use child;
 use emoji;
 use error::Error;
@@ -127,10 +128,17 @@ pub fn wasm_bindgen_build(
     let out_dir = out_dir.to_str().unwrap();
 
     if let Some(wasm_bindgen_path) = wasm_bindgen_path(log, path) {
-        let wasm_path = format!(
-            "target/wasm32-unknown-unknown/{}/{}.wasm",
-            release_or_debug, binary_name
-        );
+        let manifest = path.join("Cargo.toml");
+        let target_path = cargo_metadata::metadata(Some(&manifest))
+            .unwrap()
+            .target_directory;
+        let mut wasm_path = PathBuf::from(&target_path)
+            .join("wasm32-unknown-unknown")
+            .join(release_or_debug)
+            .join(binary_name);
+        wasm_path.set_extension("wasm");
+        let wasm_path = wasm_path.display().to_string();
+
         let dts_arg = if disable_dts {
             "--no-typescript"
         } else {
diff --git a/tests/all/build.rs b/tests/all/build.rs
index 69a9bab9..240a1a2f 100644
--- a/tests/all/build.rs
+++ b/tests/all/build.rs
@@ -20,3 +20,18 @@ fn build_in_non_crate_directory_doesnt_panic() {
     let err_msg = result.unwrap_err().to_string();
     assert!(err_msg.contains("missing a `Cargo.toml`"));
 }
+
+#[test]
+fn it_should_build_js_hello_world_example() {
+    let fixture = utils::fixture::js_hello_world();
+    fixture.install_local_wasm_bindgen();
+    let cli = Cli::from_iter_safe(vec![
+        "wasm-pack",
+        "build",
+        &fixture.path.display().to_string(),
+    ])
+    .unwrap();
+    let logger = logger::new(&cli.cmd, cli.verbosity).unwrap();
+    command::run_wasm_pack(cli.cmd, &logger)
+        .expect("running wasm-pack in a js-hello-world directory should succeed.");
+}