diff --git a/src/librustc_ast/lib.rs b/src/librustc_ast/lib.rs
index f81622d091400..cb3118cba23dd 100644
--- a/src/librustc_ast/lib.rs
+++ b/src/librustc_ast/lib.rs
@@ -19,6 +19,10 @@
 #![feature(unicode_internals)]
 #![recursion_limit = "256"]
 
+// FIXME(#56935): Work around ICEs during cross-compilation.
+#[allow(unused)]
+extern crate rustc_macros;
+
 #[macro_export]
 macro_rules! unwrap_or {
     ($opt:expr, $default:expr) => {
diff --git a/src/librustc_attr/lib.rs b/src/librustc_attr/lib.rs
index 66c4495c5afc8..5754bb48d24e1 100644
--- a/src/librustc_attr/lib.rs
+++ b/src/librustc_attr/lib.rs
@@ -6,6 +6,10 @@
 
 #![feature(or_patterns)]
 
+// FIXME(#56935): Work around ICEs during cross-compilation.
+#[allow(unused)]
+extern crate rustc_macros;
+
 mod builtin;
 
 pub use builtin::*;
diff --git a/src/librustc_target/lib.rs b/src/librustc_target/lib.rs
index b2965fb880681..a0229a5daf0dc 100644
--- a/src/librustc_target/lib.rs
+++ b/src/librustc_target/lib.rs
@@ -17,6 +17,10 @@
 #![feature(associated_type_bounds)]
 #![feature(exhaustive_patterns)]
 
+// FIXME(#56935): Work around ICEs during cross-compilation.
+#[allow(unused)]
+extern crate rustc_macros;
+
 #[macro_use]
 extern crate log;