diff --git a/library/std/src/sys/unsupported/args.rs b/library/std/src/sys/unsupported/args.rs
index c924a7d8a26..a2d75a61976 100644
--- a/library/std/src/sys/unsupported/args.rs
+++ b/library/std/src/sys/unsupported/args.rs
@@ -1,4 +1,5 @@
 use crate::ffi::OsString;
+use crate::fmt;
 
 pub struct Args {}