diff --git a/compiler/rustc_hir/src/lang_items.rs b/compiler/rustc_hir/src/lang_items.rs
index 311cf8f995c82..3ad526bcfd826 100644
--- a/compiler/rustc_hir/src/lang_items.rs
+++ b/compiler/rustc_hir/src/lang_items.rs
@@ -38,6 +38,7 @@ impl LanguageItems {
         }
     }
 
+    #[inline]
     pub fn get(&self, item: LangItem) -> Option<DefId> {
         self.items[item as usize]
     }
diff --git a/compiler/rustc_middle/src/middle/lang_items.rs b/compiler/rustc_middle/src/middle/lang_items.rs
index a0e4c288c4a85..e7a63f68b88b8 100644
--- a/compiler/rustc_middle/src/middle/lang_items.rs
+++ b/compiler/rustc_middle/src/middle/lang_items.rs
@@ -23,6 +23,7 @@ impl<'tcx> TyCtxt<'tcx> {
         })
     }
 
+    #[inline]
     pub fn is_lang_item(self, def_id: DefId, lang_item: LangItem) -> bool {
         self.lang_items().get(lang_item) == Some(def_id)
     }