diff --git a/capnp/src/data.rs b/capnp/src/data.rs
index 411fc6cf3..23590b518 100644
--- a/capnp/src/data.rs
+++ b/capnp/src/data.rs
@@ -82,6 +82,21 @@ impl<'a> crate::traits::SetterInput<Owned> for Reader<'a> {
     }
 }
 
+impl<'a, const N: usize> crate::traits::SetterInput<Owned> for &'a [u8; N] {
+    #[inline]
+    fn set_pointer_builder<'b>(
+        pointer: PointerBuilder<'b>,
+        value: &'a [u8; N],
+        canonicalize: bool,
+    ) -> Result<()> {
+        <Reader<'a> as crate::traits::SetterInput<Owned>>::set_pointer_builder(
+            pointer,
+            &value[..],
+            canonicalize,
+        )
+    }
+}
+
 impl<'a> From<Reader<'a>> for crate::dynamic_value::Reader<'a> {
     fn from(d: Reader<'a>) -> crate::dynamic_value::Reader<'a> {
         crate::dynamic_value::Reader::Data(d)
diff --git a/capnp/src/data_list.rs b/capnp/src/data_list.rs
index 2b037f70b..b3afbbf1e 100644
--- a/capnp/src/data_list.rs
+++ b/capnp/src/data_list.rs
@@ -22,7 +22,7 @@
 //! List of sequences of bytes.
 
 use crate::private::layout::*;
-use crate::traits::{FromPointerBuilder, FromPointerReader, IndexMove, ListIter};
+use crate::traits::{FromPointerBuilder, FromPointerReader, IndexMove, ListIter, SetterInput};
 use crate::Result;
 
 #[derive(Copy, Clone)]
@@ -134,12 +134,17 @@ impl<'a> Builder<'a> {
         }
     }
 
-    pub fn set(&mut self, index: u32, value: crate::data::Reader) {
+    #[inline]
+    pub fn set(&mut self, index: u32, value: impl SetterInput<crate::data::Owned>) {
         assert!(index < self.len());
-        self.builder
-            .reborrow()
-            .get_pointer_element(index)
-            .set_data(value);
+        SetterInput::set_pointer_builder(
+            self.builder.reborrow().get_pointer_element(index),
+            value,
+            false,
+        )
+        .unwrap()
+        // The text impls of SetterInput never return an error, so
+        // the above unwrap() won't panic.
     }
 
     pub fn reborrow(&mut self) -> Builder<'_> {
diff --git a/capnpc/src/codegen.rs b/capnpc/src/codegen.rs
index a323f0c30..d745efd59 100644
--- a/capnpc/src/codegen.rs
+++ b/capnpc/src/codegen.rs
@@ -1093,15 +1093,19 @@ fn generate_setter(
                     )
                 }
                 type_::Data(()) => {
-                    setter_interior.push(Line(format!(
-                        "self.builder.reborrow().get_pointer_field({offset}).set_data(value);"
+                    // The data::Reader impl of SetterInput never fails, so we can unwrap().
+                    setter_interior.push(Line(fmt!(ctx,
+                        "{capnp}::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field({offset}), value, false).unwrap()"
                     )));
                     initter_interior.push(Line(format!(
                         "self.builder.get_pointer_field({offset}).init_data(size)"
                     )));
                     initter_params.push("size: u32");
                     (
-                        Some(fmt!(ctx, "{capnp}::data::Reader<'_>")),
+                        Some(fmt!(
+                            ctx,
+                            "impl {capnp}::traits::SetterInput<{capnp}::data::Owned>"
+                        )),
                         Some(fmt!(ctx, "{capnp}::data::Builder<'a>")),
                     )
                 }
@@ -1176,7 +1180,11 @@ fn generate_setter(
                         Line(fmt!(ctx,"{capnp}::traits::SetterInput::set_pointer_builder(self.builder.reborrow().get_pointer_field({offset}), value, false)")));
 
                     (
-                        Some(typ.type_string(ctx, Leaf::Reader("'_"))?),
+                        Some(fmt!(
+                            ctx,
+                            "impl {capnp}::traits::SetterInput<{}>",
+                            typ.type_string(ctx, Leaf::Owned)?
+                        )),
                         Some(typ.type_string(ctx, Leaf::Builder("'a"))?),
                     )
                 }
diff --git a/capnpc/test/test.rs b/capnpc/test/test.rs
index 2afb89ec5..873afd401 100644
--- a/capnpc/test/test.rs
+++ b/capnpc/test/test.rs
@@ -1524,10 +1524,8 @@ mod tests {
                 .allocation_strategy(::capnp::message::AllocationStrategy::FixedSize);
             let mut message2 = message::Builder::new(builder_options);
             let mut all_types2 = message2.init_root::<test_all_types::Builder<'_>>();
-
-            all_types2
-                .set_struct_field(message.get_root_as_reader().unwrap())
-                .unwrap();
+            let root_reader: test_all_types::Reader<'_> = message.get_root_as_reader().unwrap();
+            all_types2.set_struct_field(root_reader).unwrap();
             CheckTestMessage::check_test_message(all_types2.reborrow().get_struct_field().unwrap());
 
             let reader = all_types2.into_reader().get_struct_field().unwrap();