diff --git a/src/main.rs b/src/main.rs
index c08591d..12729fe 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -519,12 +519,14 @@ fn mode_diff(cmd: &mut Command, args: Args, ids: &mut Vec<i64>, tags: &mut Vec<S
 
             let compression_engine_b = compression::get_engine(compression_type_b).expect("Unable to get compression engine");
 
-            let (_fd_a_read, fd_a_write) = unistd::pipe().unwrap();
-            let (_fd_b_read, fd_b_write) = unistd::pipe().unwrap();
+            let (fd_a_read, fd_a_write) = unistd::pipe().unwrap();
+            let (fd_b_read, fd_b_write) = unistd::pipe().unwrap();
 
             let child = std::process::Command::new("diff")
                 .arg("-u")
-                .stdin(std::process::Stdio::piped())
+                .arg(format!("/dev/fd/{}", fd_a_read))
+                .arg(format!("/dev/fd/{}", fd_b_read))
+                .stdin(std::process::Stdio::null())
                 .stdout(std::process::Stdio::piped())
                 .stderr(std::process::Stdio::piped())
                 .spawn()