diff --git a/2015/day-04/main.rs b/2015/day-04/src/main.rs
similarity index 97%
rename from 2015/day-04/main.rs
rename to 2015/day-04/src/main.rs
index e6b6396..bb87732 100644
--- a/2015/day-04/main.rs
+++ b/2015/day-04/src/main.rs
@@ -8,8 +8,8 @@ macro_rules! infile {
 }
 
 const INPUTS: &[(&str, &str)] = &[
-    infile!("inputs/test.txt"),
-    infile!("inputs/puzzle.txt"),
+    infile!("../inputs/test.txt"),
+    infile!("../inputs/puzzle.txt"),
 ];
 
 fn extract_result(pool: &ThreadPool<Vec<usize>>) -> Option<usize> {
diff --git a/2015/day-04/md5.rs b/2015/day-04/src/md5.rs
similarity index 100%
rename from 2015/day-04/md5.rs
rename to 2015/day-04/src/md5.rs
diff --git a/2015/day-04/threadpool.rs b/2015/day-04/src/threadpool.rs
similarity index 100%
rename from 2015/day-04/threadpool.rs
rename to 2015/day-04/src/threadpool.rs