diff --git a/pbjson-types/build.rs b/pbjson-types/build.rs
index 9ef2b31..4430fca 100644
--- a/pbjson-types/build.rs
+++ b/pbjson-types/build.rs
@@ -1,15 +1,13 @@
 //! Compiles Protocol Buffers and FlatBuffers schema definitions into
 //! native Rust types.
 
-use std::env;
 use std::path::PathBuf;
 
 type Error = Box<dyn std::error::Error>;
 type Result<T, E = Error> = std::result::Result<T, E>;
 
 fn main() -> Result<()> {
-    let root = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
-    let descriptor_path = root.join("descriptors.bin");
+    let descriptor_path: PathBuf = "descriptors.bin".into();
     println!("cargo:rerun-if-changed={}", descriptor_path.display());
 
     let mut config = prost_build::Config::new();