diff --git a/acpi_tables/src/aml.rs b/acpi_tables/src/aml.rs
index b267c7d5c..90588440a 100644
--- a/acpi_tables/src/aml.rs
+++ b/acpi_tables/src/aml.rs
@@ -494,16 +494,14 @@ impl Io {
 }
 
 impl Aml for Io {
-    fn to_aml_bytes(&self) -> Vec<u8> {
-        let mut bytes = vec![0x47]; /* Io Port Descriptor */
+    fn append_aml_bytes(&self, bytes: &mut Vec<u8>) {
+        bytes.push(0x47); /* Io Port Descriptor */
 
         bytes.push(1); /* IODecode16 */
         bytes.append(&mut self.min.to_le_bytes().to_vec());
         bytes.append(&mut self.max.to_le_bytes().to_vec());
         bytes.push(self.alignment);
         bytes.push(self.length);
-
-        bytes
     }
 }