diff --git a/testing/Cargo.toml b/testing/Cargo.toml
index 184cb7fa..9ad1333f 100644
--- a/testing/Cargo.toml
+++ b/testing/Cargo.toml
@@ -9,19 +9,16 @@ repository = "https://github.com/serde-rs/serde"
 documentation = "https://docs.serde.rs/serde/"
 readme = "README.md"
 keywords = ["serialization"]
-build = "build.rs"
 publish = false
 
 [features]
-unstable-testing = ["clippy", "serde/unstable-testing", "serde_codegen/unstable-testing"]
-
-[build-dependencies]
-serde_codegen = { path = "../serde_codegen", features = ["with-syntex"] }
+unstable-testing = ["clippy", "serde/unstable-testing", "serde_derive/unstable-testing"]
 
 [dev-dependencies]
 fnv = "1.0"
 rustc-serialize = "0.3.16"
 serde = { path = "../serde" }
+serde_derive = { path = "../serde_derive" }
 serde_test = { path = "../serde_test" }
 
 [dependencies]
diff --git a/testing/build.rs b/testing/build.rs
deleted file mode 100644
index bf4a763b..00000000
--- a/testing/build.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-extern crate serde_codegen;
-
-use std::env;
-use std::path::Path;
-
-fn main() {
-    let out_dir = env::var_os("OUT_DIR").unwrap();
-    let src = Path::new("tests/test.rs.in");
-    let dst = Path::new(&out_dir).join("test.rs");
-    serde_codegen::expand(&src, &dst).unwrap();
-}
diff --git a/testing/tests/test.rs b/testing/tests/test.rs
index 03bb0a68..f7483c2f 100644
--- a/testing/tests/test.rs
+++ b/testing/tests/test.rs
@@ -3,4 +3,18 @@
 
 #![cfg_attr(feature = "unstable-testing", feature(non_ascii_idents))]
 
-include!(concat!(env!("OUT_DIR"), "/test.rs"));
+#[macro_use]
+extern crate serde_derive;
+
+extern crate serde;
+extern crate serde_test;
+
+#[macro_use]
+mod macros;
+
+mod test_annotations;
+mod test_bytes;
+mod test_de;
+mod test_gen;
+mod test_macros;
+mod test_ser;
diff --git a/testing/tests/test.rs.in b/testing/tests/test.rs.in
deleted file mode 100644
index 04c69bdb..00000000
--- a/testing/tests/test.rs.in
+++ /dev/null
@@ -1,12 +0,0 @@
-extern crate serde;
-extern crate serde_test;
-
-#[macro_use]
-mod macros;
-
-mod test_annotations;
-mod test_bytes;
-mod test_de;
-mod test_gen;
-mod test_macros;
-mod test_ser;