diff --git a/src/common.rs b/src/common.rs
index 0775b8a025f6c237bd804aa78aa222baf3ffebfe..e7a6037b9085fbbe67ec46ab9eafe6bbf6140448 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -2,7 +2,7 @@
 
 pub use core::{
     cmp::Ordering,
-    fmt::Debug,
+    fmt::{Debug, Formatter},
     hash::{Hash, Hasher},
     ops::{Range, RangeFrom},
     time::Duration,