diff --git a/pkg/chains/chains.go b/pkg/chains/chains.go
index 6eacd7131f..e88fb5e8ed 100644
--- a/pkg/chains/chains.go
+++ b/pkg/chains/chains.go
@@ -391,7 +391,7 @@ func CombineDefaultChainsList(chains []Chain) []*Chain {
 // CombineChainList combines a list of chains with a list of chains
 // duplicated chain ID are overwritten by the second list
 func CombineChainList(chains1 []*Chain, chains2 []*Chain) []*Chain {
-	combined := make([]*Chain, 0)
+	combined := make([]*Chain, 0, len(base) + len(additional))
 	combined = append(combined, chains1...)
 
 	// map chain ID in chains1 to index in the list