diff --git a/crates/trie/common/src/utils.rs b/crates/trie/common/src/utils.rs
index 7c1d454a6f..9ee876cada 100644
--- a/crates/trie/common/src/utils.rs
+++ b/crates/trie/common/src/utils.rs
@@ -40,6 +40,7 @@ where
     if other.is_empty() {
         return;
     }
+    target.reserve(other.len());
 
     let mut other_iter = other.iter().peekable();
     let initial_len = target.len();