diff --git a/crates/ra_hir/src/code_model_api.rs b/crates/ra_hir/src/code_model_api.rs
index f1e891722c..6bbc80e17c 100644
--- a/crates/ra_hir/src/code_model_api.rs
+++ b/crates/ra_hir/src/code_model_api.rs
@@ -35,8 +35,8 @@ pub struct Module {
 }
 
 impl Module {
-    pub fn source(&self, db: &impl HirDatabase) -> (FileId, Option<ast::ModuleNode>) {
-        self.source_impl(db)
+    pub fn source(&self, db: &impl HirDatabase) -> Cancelable<(FileId, Option<ast::ModuleNode>)> {
+        Ok(self.source_impl(db))
     }
 
     /// Returns the crate this module is part of.