diff --git a/src/digest_engine/program.rs b/src/digest_engine/program.rs
index 6d4c439..770fd50 100644
--- a/src/digest_engine/program.rs
+++ b/src/digest_engine/program.rs
@@ -1,4 +1,4 @@
-use crate::common::ProgramWriter;
+use crate::plugins::ProgramWriter;
 use anyhow::{Context, Result, anyhow};
 use log::*;
 use std::env;
diff --git a/src/meta_plugin/program.rs b/src/meta_plugin/program.rs
index 80fb5e9..4870067 100644
--- a/src/meta_plugin/program.rs
+++ b/src/meta_plugin/program.rs
@@ -1,4 +1,4 @@
-use crate::common::ProgramWriter;
+use crate::plugins::ProgramWriter;
 use anyhow::{Context, Result, anyhow};
 use log::*;
 use std::env;
diff --git a/src/plugins.rs b/src/plugins.rs
new file mode 100644
index 0000000..9d9f6ff
--- /dev/null
+++ b/src/plugins.rs
@@ -0,0 +1,15 @@
+pub(crate) use std::io::Write;
+
+pub struct ProgramWriter {
+    stdin: std::process::ChildStdin,
+}
+
+impl Write for ProgramWriter {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        self.stdin.write(buf)
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        self.stdin.flush()
+    }
+}