diff --git a/impl/src/fmt.rs b/impl/src/fmt.rs
index d984bfd..6b1e7fa 100644
--- a/impl/src/fmt.rs
+++ b/impl/src/fmt.rs
@@ -78,7 +78,7 @@ impl Display<'_> {
             let formatvar = match &member {
                 MemberUnraw::Unnamed(index) => IdentUnraw::new(format_ident!("__field{}", index)),
                 MemberUnraw::Named(ident) => {
-                    if user_named_args.contains(ident) {
+                    if user_named_args.contains(ident) || ident == "_" {
                         // Refers to a named argument written by the user, not to field.
                         out += &ident.to_string();
                         continue;
diff --git a/tests/ui/display-underscore.stderr b/tests/ui/display-underscore.stderr
index 3935970..36882b9 100644
--- a/tests/ui/display-underscore.stderr
+++ b/tests/ui/display-underscore.stderr
@@ -1,5 +1,7 @@
-error: in expressions, `_` can only be used on the left-hand side of an assignment
- --> tests/ui/display-underscore.rs:4:9
+error: invalid format string: invalid argument name `_`
+ --> tests/ui/display-underscore.rs:4:11
   |
 4 | #[error("{_}")]
-  |         ^^^^^ `_` not allowed here
+  |           ^ invalid argument name in format string
+  |
+  = note: argument name cannot be a single underscore