diff --git a/src/front/spv/mod.rs b/src/front/spv/mod.rs
index c39967bc55..ad68a2417f 100644
--- a/src/front/spv/mod.rs
+++ b/src/front/spv/mod.rs
@@ -1123,8 +1123,7 @@ impl<I: Iterator<Item = u32>> Frontend<I> {
         block: &mut crate::Block,
         block_id: spirv::Word,
         body_idx: usize,
-        axis: crate::DerivativeAxis,
-        ctrl: crate::DerivativeControl,
+        (axis, ctrl): (crate::DerivativeAxis, crate::DerivativeControl),
     ) -> Result<(), Error> {
         let start = self.data_offset;
         let result_type_id = self.next()?;
@@ -1297,8 +1296,7 @@ impl<I: Iterator<Item = u32>> Frontend<I> {
                     &mut block,
                     block_id,
                     body_idx,
-                    $axis,
-                    $ctrl,
+                    ($axis, $ctrl),
                 )
             };
         }