diff --git a/crates/ra_hir/src/nameres/collector.rs b/crates/ra_hir/src/nameres/collector.rs
index 12ed49a0a5..3ea8d592c6 100644
--- a/crates/ra_hir/src/nameres/collector.rs
+++ b/crates/ra_hir/src/nameres/collector.rs
@@ -124,7 +124,7 @@ where
     }
 
     fn resolve_import(
-        &mut self,
+        &self,
         module_id: CrateModuleId,
         import: &raw::ImportData,
     ) -> (PerNs<ModuleDef>, ReachedFixedPoint) {