diff --git a/compiler/cl-structures/src/index_map.rs b/compiler/cl-structures/src/index_map.rs
index e6c90a7..3765a55 100644
--- a/compiler/cl-structures/src/index_map.rs
+++ b/compiler/cl-structures/src/index_map.rs
@@ -106,7 +106,7 @@ impl<V, K: MapIndex> IndexMap<K, V> {
     pub fn get_many_mut<const N: usize>(
         &mut self,
         indices: [K; N],
-    ) -> Result<[&mut V; N], GetManyMutError<N>> {
+    ) -> Result<[&mut V; N], GetManyMutError> {
         self.map.get_many_mut(indices.map(|id| id.get()))
     }