diff --git a/src/main.rs b/src/main.rs
index ecb218e..c8ae8c8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,6 +11,8 @@ use std::fs;
 use std::io::Read;
 use walkdir::WalkDir;
 use std::fmt;
+use std::thread;
+use std::sync::{Arc, Mutex};
 
 const BUFFER_SIZE: usize = 1024;
 
@@ -134,7 +136,7 @@ impl FileToProcess {
 }
 
 fn main() {
-    let mut files_candidate = vec![];
+    let files_candidate = Arc::new(Mutex::new(Vec::new()));
     let mut t = term::stdout().unwrap();
     let matches = App::new("rdupe")
         .version("0.1.0")
@@ -201,33 +203,43 @@ fn main() {
     }
 
     // Walk through path 1 & 2 [Todo: threading]
-    for s in &[&args.input, &args.output] {
-        for entry in WalkDir::new(&s)
-            .into_iter()
-            .filter_map(|e| e.ok())
-        {
-            // symlink_metadata does not follow symlink :-]
-            let metadata = fs::symlink_metadata(entry.path()).unwrap();
-            let ft = metadata.file_type();
+    let mut children = vec![];
+    let args_source = vec![args.input, args.output];
+    for s in args_source {
+        let fc = files_candidate.clone();
+        children.push(thread::spawn(move || {
+            for entry in WalkDir::new(&s)
+                .into_iter()
+                .filter_map(|e| e.ok())
+            {
+                // symlink_metadata does not follow symlink :-]
+                let metadata = fs::symlink_metadata(entry.path()).unwrap();
+                let ft = metadata.file_type();
 
-            if ft.is_file() {
-                if let Ok(mut file) = fs::File::open(&entry.path()) {
-                    let mut a = FileToProcess {
-                        name: format!("{}",
-                                      entry.path().display()),
-                        hash: vec![],
-                        realpath: String::from("TODO"),
-                    };
+                if ft.is_file() {
+                    if let Ok(mut file) = fs::File::open(&entry.path()) {
+                        let mut a = FileToProcess {
+                            name: format!("{}",
+                                          entry.path().display()),
+                            hash: vec![],
+                            realpath: String::from("TODO"),
+                        };
 
-                    // compute file hash
-                    a.hash::<Sha256, _>(&mut file);
-                    files_candidate.push(a);
+                        // compute file hash
+                        a.hash::<Sha256, _>(&mut file);
+                        fc.lock().unwrap().push(a);
+                    }
                 }
             }
-        }
+        }));
     }
 
-    for i in files_candidate {
+    for child in children {
+        // Wait for the thread to finish. Returns a result.
+        let _ = child.join();
+    }
+
+    for i in files_candidate.lock().unwrap().iter() {
         println!("{}", i);
     }