diff --git a/components/salsa-macro-rules/src/setup_input_struct.rs b/components/salsa-macro-rules/src/setup_input_struct.rs
index a2a1d2fb..067bcdc3 100644
--- a/components/salsa-macro-rules/src/setup_input_struct.rs
+++ b/components/salsa-macro-rules/src/setup_input_struct.rs
@@ -143,6 +143,7 @@ macro_rules! setup_input_struct {
                     // because $Configuration can't be named in `builder`.
                     impl builder::$Builder {
                         /// Creates the new input with the set values.
+                        #[must_use]
                         pub fn new<$Db>(self, db: &$Db) -> $Struct
                         where
                             // FIXME(rust-lang/rust#65991): The `db` argument *should* have the type `dyn Database`
@@ -259,6 +260,7 @@ macro_rules! setup_input_struct {
                     (builder.fields, stamps)
                 }
 
+                #[must_use]
                 pub struct $Builder {
                     /// The field values.
                     fields: ($($field_ty,)*),