diff --git a/macro/src/expand.rs b/macro/src/expand.rs
index 3189bff..8223572 100644
--- a/macro/src/expand.rs
+++ b/macro/src/expand.rs
@@ -228,7 +228,7 @@
             // These are arguments for which C++ has taken ownership of the data
             // behind the mut reference it received.
             quote! {
-                let mut #var = std::mem::MaybeUninit::new(#var);
+                let mut #var = ::std::mem::MaybeUninit::new(#var);
             }
         })
         .collect::<TokenStream>();