diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 2381623b841f..01bcfec4bdc0 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -961,7 +961,6 @@ struct DeriveData {
     has_derive_copy: bool,
 }
 
-#[derive(Clone)]
 struct MacroData {
     ext: Lrc<SyntaxExtension>,
     rule_spans: Vec<(usize, Span)>,