diff --git a/src/tools/tidy/src/deps.rs b/src/tools/tidy/src/deps.rs
index f8afb44e75b..a046e0acdde 100644
--- a/src/tools/tidy/src/deps.rs
+++ b/src/tools/tidy/src/deps.rs
@@ -110,6 +110,7 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
     "datafrog",
     "difference",
     "digest",
+    "displaydoc",
     "dlmalloc",
     "either",
     "ena",