diff --git a/2025/tester.rs b/2025/tester.rs
index 5571f3d..5ba8b8d 100644
--- a/2025/tester.rs
+++ b/2025/tester.rs
@@ -177,12 +177,12 @@ pub mod loader {
         untry!(unsafe { handle.symfn::<C<isize>>(c"challenge_isize") }.map(V::Isize));
         untry!(unsafe { handle.symfn::<C<usize>>(c"challenge_usize") }.map(V::Usize));
         untry!(
-            unsafe { handle.symfn::<C<(usize, usize)>>(c"challenge_isize_duple") }
-                .map(V::UsizeDuple)
+            unsafe { handle.symfn::<C<(isize, isize)>>(c"challenge_isize_duple") }
+                .map(V::IsizeDuple)
         );
         untry!(
-            unsafe { handle.symfn::<C<(isize, isize)>>(c"challenge_usize_duple") }
-                .map(V::IsizeDuple)
+            unsafe { handle.symfn::<C<(usize, usize)>>(c"challenge_usize_duple") }
+                .map(V::UsizeDuple)
         );
 
         None