diff --git a/build.rs b/build.rs
index 53d07ee5737aa0803bb2a6b33525d5c8879bb1f3..117deebeb43d8afc3bfa79f6877f593bf8999038 100644
--- a/build.rs
+++ b/build.rs
@@ -66,6 +66,7 @@ fn fill_from_location(f: &mut fs::File, loc: &Path ) -> Result<(), (Error)> {
         let sub = folders.get(*dir).unwrap();
         let mut first = true;
         for child in sub.iter() {
+            let idx = child.rfind('/').unwrap() + 1;
             let (_, c) = child.split_at(idx);
             if first {
                 write!(f, "{}", c)?;
@@ -108,4 +109,4 @@ mod gen {
     }
 }
     ").unwrap();
-}
\ No newline at end of file
+}