diff --git a/src/tools/build-manifest/src/main.rs b/src/tools/build-manifest/src/main.rs
index 2a24edd4e3f33..6fe8b96b75b40 100644
--- a/src/tools/build-manifest/src/main.rs
+++ b/src/tools/build-manifest/src/main.rs
@@ -362,7 +362,8 @@ impl Builder {
     fn hash(&self, path: &Path) -> String {
         let sha = t!(Command::new("shasum")
                         .arg("-a").arg("256")
-                        .arg(path)
+                        .arg(path.file_name().unwrap())
+                        .current_dir(path.parent().unwrap())
                         .output());
         assert!(sha.status.success());