1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/CustomTypeTemplate.kt b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/CustomTypeTemplate.kt
index 04150c5d78..aeb5f58002 100644
--- a/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/CustomTypeTemplate.kt
+++ b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/CustomTypeTemplate.kt
@@ -49,7 +49,7 @@ public object {{ ffi_converter_name }}: FfiConverter<{{ name }}, {{ ffi_type_nam
         return {{ config.into_custom.render("builtinValue") }}
     }
 
-    override fun allocationSize(value: {{ name }}): Int {
+    override fun allocationSize(value: {{ name }}): ULong {
         val builtinValue = {{ config.from_custom.render("value") }}
         return {{ builtin|allocation_size_fn }}(builtinValue)
     }