diff --git a/src/macros.rs b/src/macros.rs
index 4de6b5aa11..1a3c8d47ad 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -1,4 +1,5 @@
 // See the cfg-if crate.
+#[allow(unused)]
 macro_rules! cfg_if {
     // match if/else chains with a final `else`
     ($(