diff --git a/src/comp/back/rpath.rs b/src/comp/back/rpath.rs
index 80ace14a4d0..a1bcb8f8bd3 100644
--- a/src/comp/back/rpath.rs
+++ b/src/comp/back/rpath.rs
@@ -227,7 +227,7 @@ mod test {
     #[test]
     fn test_prefix_rpath_abs() {
         let res = get_install_prefix_rpath("/usr/lib", "triple");
-        assert str::starts_with(res, "/");
+        assert fs::path_is_absolute(res);
     }
 
     #[test]