diff --git a/core/types.rs b/core/types.rs
index cb9c99082..a7259f8b1 100644
--- a/core/types.rs
+++ b/core/types.rs
@@ -1061,15 +1061,7 @@ impl ImmutableRecord {
     }
 
     pub fn start_serialization(&mut self, payload: &[u8]) {
-        let blob = self.as_blob_mut();
-        blob.reserve(payload.len());
-
-        let len = blob.len();
-        unsafe {
-            let dst = blob.as_mut_ptr().add(len);
-            std::ptr::copy_nonoverlapping(payload.as_ptr(), dst, payload.len());
-            blob.set_len(len + payload.len());
-        }
+        self.as_blob_mut().extend_from_slice(payload);
     }
 
     pub fn invalidate(&mut self) {