diff --git a/src/aml/mod.rs b/src/aml/mod.rs
index 6d67f282..2e043463 100644
--- a/src/aml/mod.rs
+++ b/src/aml/mod.rs
@@ -529,10 +529,17 @@ where
                         let source1 = source1.as_buffer()?;
                         let source2 = source2.as_buffer()?;
                         let result = {
-                            let mut buffer = Vec::from(source1);
-                            buffer.extend_from_slice(source2);
+                            fn strip_end_tag(buf: &[u8]) -> &[u8] {
+                                if buf.len() >= 2 && buf[buf.len() - 2] == 0x79 {
+                                    buf.split_at(buf.len() - 2).0
+                                } else {
+                                    buf
+                                }
+                            }
+                            let mut buffer = Vec::from(strip_end_tag(source1));
+                            buffer.extend_from_slice(strip_end_tag(source2));
                             // Add a new end-tag
-                            buffer.push(0x78);
+                            buffer.push(0x79);
                             // Don't calculate the new real checksum - just use 0
                             buffer.push(0x00);
                             Object::Buffer(buffer).wrap()