diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index ca9c124fca63c..04ff76e6bd6be 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -781,7 +781,10 @@ impl<'ra> std::ops::Deref for Module<'ra> {
 
 impl<'ra> fmt::Debug for Module<'ra> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{:?}", self.res())
+        match self.kind {
+            ModuleKind::Block => write!(f, "block"),
+            ModuleKind::Def(..) => write!(f, "{:?}", self.res()),
+        }
     }
 }