diff --git a/src/librustc_errors/lib.rs b/src/librustc_errors/lib.rs
index 6585633e00af..b5341a2b727a 100644
--- a/src/librustc_errors/lib.rs
+++ b/src/librustc_errors/lib.rs
@@ -845,3 +845,11 @@ impl Level {
         }
     }
 }
+
+#[macro_export]
+macro_rules! pluralise {
+            ($x:expr) => {
+                if $x != 1 { "s" } else { "" }
+            };
+}
+