diff --git a/src/main.rs b/src/main.rs
index a664d7b..2ae0a9b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,6 +5,7 @@ use std::str::FromStr;
 use std::path::PathBuf;
 use std::collections::HashMap;
 use std::env;
+use std::os::fd::FromRawFd;
 
 use regex::Regex;
 
@@ -529,8 +530,8 @@ fn mode_diff(cmd: &mut Command, args: Args, ids: &mut Vec<i64>, tags: &mut Vec<S
                 .spawn()
                 .expect("Failed to execute diff command");
 
-            let mut stdout_a = unsafe { std::fs::File::from_raw_fd(fd_a_write) };
-            let mut stdout_b = unsafe { std::fs::File::from_raw_fd(fd_b_write) };
+            let stdout_a = unsafe { std::fs::File::from_raw_fd(fd_a_write) };
+            let stdout_b = unsafe { std::fs::File::from_raw_fd(fd_b_write) };
 
             compression_engine_a.cat(item_path_a.clone())?;
             compression_engine_b.cat(item_path_b.clone())?;