diff --git a/components/salsa-2022-macros/src/tracked_fn.rs b/components/salsa-2022-macros/src/tracked_fn.rs
index d5bcb940..01f6ebe4 100644
--- a/components/salsa-2022-macros/src/tracked_fn.rs
+++ b/components/salsa-2022-macros/src/tracked_fn.rs
@@ -230,6 +230,48 @@ fn ingredients_for_impl(
         }
     };
 
+    let function: syn::Expr = if let Some(lru) = args.lru.clone() {
+        parse_quote! {
+            {
+                let index = routes.push(
+                    |jars| {
+                        let jar = <DB as salsa::storage::JarFromJars<Self::Jar>>::jar_from_jars(jars);
+                        let ingredients =
+                            <_ as salsa::storage::HasIngredientsFor<Self::Ingredients>>::ingredient(jar);
+                        &ingredients.function
+                    },
+                    |jars| {
+                        let jar = <DB as salsa::storage::JarFromJars<Self::Jar>>::jar_from_jars_mut(jars);
+                        let ingredients =
+                            <_ as salsa::storage::HasIngredientsFor<Self::Ingredients>>::ingredient_mut(jar);
+                        &mut ingredients.function
+                    });
+                let ingredient = salsa::function::FunctionIngredient::new(index);
+                ingredient.set_capacity(#lru);
+                ingredient
+            }
+        }
+    } else {
+        parse_quote! {
+            {
+                let index = routes.push(
+                    |jars| {
+                        let jar = <DB as salsa::storage::JarFromJars<Self::Jar>>::jar_from_jars(jars);
+                        let ingredients =
+                            <_ as salsa::storage::HasIngredientsFor<Self::Ingredients>>::ingredient(jar);
+                        &ingredients.function
+                    },
+                    |jars| {
+                        let jar = <DB as salsa::storage::JarFromJars<Self::Jar>>::jar_from_jars_mut(jars);
+                        let ingredients =
+                            <_ as salsa::storage::HasIngredientsFor<Self::Ingredients>>::ingredient_mut(jar);
+                        &mut ingredients.function
+                    });
+                salsa::function::FunctionIngredient::new(index)
+            }
+        }
+    };
+
     parse_quote! {
         impl salsa::storage::IngredientsFor for #config_ty {
             type Ingredients = Self;
@@ -242,22 +284,7 @@ fn ingredients_for_impl(
                 Self {
                     intern_map: #intern_map,
 
-                    function: {
-                        let index = routes.push(
-                            |jars| {
-                                let jar = <DB as salsa::storage::JarFromJars<Self::Jar>>::jar_from_jars(jars);
-                                let ingredients =
-                                    <_ as salsa::storage::HasIngredientsFor<Self::Ingredients>>::ingredient(jar);
-                                &ingredients.function
-                            },
-                            |jars| {
-                                let jar = <DB as salsa::storage::JarFromJars<Self::Jar>>::jar_from_jars_mut(jars);
-                                let ingredients =
-                                    <_ as salsa::storage::HasIngredientsFor<Self::Ingredients>>::ingredient_mut(jar);
-                                &mut ingredients.function
-                            });
-                        salsa::function::FunctionIngredient::new(index)
-                    },
+                    function: #function
                 }
             }
         }
diff --git a/components/salsa-2022/src/function/lru.rs b/components/salsa-2022/src/function/lru.rs
index fdc80073..9d95f8b2 100644
--- a/components/salsa-2022/src/function/lru.rs
+++ b/components/salsa-2022/src/function/lru.rs
@@ -18,6 +18,7 @@ impl Lru {
             return None;
         }
 
+
         let mut set = self.set.lock();
         set.insert(index);
         if set.len() > capacity {
diff --git a/salsa-2022-tests/tests/lru.rs b/salsa-2022-tests/tests/lru.rs
index 324d1372..d6e3031d 100644
--- a/salsa-2022-tests/tests/lru.rs
+++ b/salsa-2022-tests/tests/lru.rs
@@ -9,7 +9,7 @@ use expect_test::expect;
 use test_log::test;
 
 #[salsa::jar(db = Db)]
-struct Jar(MyInput, get_hot_potato);
+struct Jar(MyInput, get_hot_potato, EmptyInput);
 
 trait Db: salsa::DbWithJar<Jar> + HasLogger {}
 
@@ -43,6 +43,9 @@ fn get_hot_potato(db: &dyn Db, input: MyInput) -> Arc<HotPotato> {
     Arc::new(HotPotato::new(input.field(db)))
 }
 
+#[salsa::input(jar = Jar)]
+struct EmptyInput {}
+
 #[salsa::db(Jar)]
 #[derive(Default)]
 struct Database {
@@ -78,7 +81,6 @@ fn execute() {
         let p = get_hot_potato(&db, input);
         assert_eq!(p.0, i)
     }
+    EmptyInput::new(&mut db);
     assert_eq!(load_n_potatoes(), 32);
-
-
 }
\ No newline at end of file