diff --git a/compiler/rustc_session/src/parse.rs b/compiler/rustc_session/src/parse.rs
index d6c58e9d1be..1db31f5b0a7 100644
--- a/compiler/rustc_session/src/parse.rs
+++ b/compiler/rustc_session/src/parse.rs
@@ -340,4 +340,8 @@ pub fn proc_macro_quoted_spans(&self) -> impl Iterator<Item = (usize, Span)> + '
     pub fn dcx(&self) -> DiagCtxtHandle<'_> {
         self.dcx.handle()
     }
+
+    pub fn set_dcx(&mut self, dcx: DiagCtxt) {
+        self.dcx = dcx;
+    }
 }