diff --git a/src/librustc_middle/ty/structural_impls.rs b/src/librustc_middle/ty/structural_impls.rs
index 463e2c57d46c..f04d31601ea5 100644
--- a/src/librustc_middle/ty/structural_impls.rs
+++ b/src/librustc_middle/ty/structural_impls.rs
@@ -262,7 +262,6 @@ CloneTypeFoldableAndLiftImpls! {
     bool,
     usize,
     ::rustc_target::abi::VariantIdx,
-    u32,
     u64,
     String,
     crate::middle::region::Scope,