diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 3b479356f8..500b34c170 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -7,7 +7,6 @@ use hir_def::{
     builtin_type::BuiltinType,
     docs::Documentation,
     expr::{BindingAnnotation, Pat, PatId},
-    nameres::ModuleSource,
     per_ns::PerNs,
     resolver::HasResolver,
     type_ref::{Mutability, TypeRef},
@@ -193,13 +192,14 @@ impl Module {
 
     pub fn diagnostics(self, db: &impl HirDatabase, sink: &mut DiagnosticSink) {
         let _p = profile("Module::diagnostics");
-        db.crate_def_map(self.id.krate).add_diagnostics(db, self.id.local_id, sink);
+        let crate_def_map = db.crate_def_map(self.id.krate);
+        crate_def_map.add_diagnostics(db, self.id.local_id, sink);
         for decl in self.declarations(db) {
             match decl {
                 crate::ModuleDef::Function(f) => f.diagnostics(db, sink),
                 crate::ModuleDef::Module(m) => {
                     // Only add diagnostics from inline modules
-                    if let ModuleSource::Module(_) = m.definition_source(db).value {
+                    if crate_def_map[m.id.local_id].origin.is_inline() {
                         m.diagnostics(db, sink)
                     }
                 }
diff --git a/crates/ra_hir_def/src/nameres.rs b/crates/ra_hir_def/src/nameres.rs
index 4d210eab12..e1a6a46df2 100644
--- a/crates/ra_hir_def/src/nameres.rs
+++ b/crates/ra_hir_def/src/nameres.rs
@@ -145,6 +145,13 @@ impl ModuleOrigin {
         }
     }
 
+    pub fn is_inline(&self) -> bool {
+        match self {
+            ModuleOrigin::Inline { .. } => true,
+            ModuleOrigin::CrateRoot { .. } | ModuleOrigin::File { .. } => false,
+        }
+    }
+
     /// Returns a node which defines this module.
     /// That is, a file or a `mod foo {}` with items.
     fn definition_source(&self, db: &impl DefDatabase) -> InFile<ModuleSource> {