diff --git a/store/cachekv/store.go b/store/cachekv/store.go
index 74122dfe3b89..48c59d8da8d3 100644
--- a/store/cachekv/store.go
+++ b/store/cachekv/store.go
@@ -59,7 +59,7 @@ func (store *Store) Get(key []byte) (value []byte) {
 
 	types.AssertValidKey(key)
 
-	cacheValue, ok := store.cache[string(key)]
+	cacheValue, ok := store.cache[conv.UnsafeBytesToStr(key)]
 	if !ok {
 		value = store.parent.Get(key)
 		store.setCacheValue(key, value, false, false)
@@ -238,12 +238,12 @@ func (store *Store) dirtyItems(start, end []byte) {
 
 // Only entrypoint to mutate store.cache.
 func (store *Store) setCacheValue(key, value []byte, deleted bool, dirty bool) {
-	store.cache[string(key)] = &cValue{
+	store.cache[conv.UnsafeBytesToStr(key)] = &cValue{
 		value:   value,
 		deleted: deleted,
 		dirty:   dirty,
 	}
 	if dirty {
-		store.unsortedCache[string(key)] = struct{}{}
+		store.unsortedCache[conv.UnsafeBytesToStr(key)] = struct{}{}
 	}
 }