1 files changed, 4 insertions, 1 deletions

diff --git a/crates/hir_def/src/diagnostics.rs b/crates/hir_def/src/diagnostics.rs
index 2e38a978f..3e19d9117 100644
--- a/crates/hir_def/src/diagnostics.rs
+++ b/crates/hir_def/src/diagnostics.rs
@@ -2,7 +2,7 @@
 
 use std::any::Any;
 
-use hir_expand::diagnostics::Diagnostic;
+use hir_expand::diagnostics::{Diagnostic, DiagnosticCode};
 use syntax::{ast, AstPtr, SyntaxNodePtr};
 
 use hir_expand::{HirFileId, InFile};
@@ -15,6 +15,9 @@ pub struct UnresolvedModule {
 }
 
 impl Diagnostic for UnresolvedModule {
+    fn code(&self) -> DiagnosticCode {
+        DiagnosticCode("unresolved-module")
+    }
     fn message(&self) -> String {
         "unresolved module".to_string()
     }