diff --git a/src/digest_engine/program.rs b/src/digest_engine/program.rs
index 53530b2..13f7d5f 100644
--- a/src/digest_engine/program.rs
+++ b/src/digest_engine/program.rs
@@ -62,7 +62,6 @@ impl DigestEngine for DigestEngineProgram {
 
         Ok(Box::new(ProgramWriter {
             stdin: process.stdin.take().unwrap(),
-            process: Some(process),
         }))
     }