diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
index eb7d1079f67..543c7507f16 100644
--- a/src/cares_wrap.cc
+++ b/src/cares_wrap.cc
@@ -627,6 +627,7 @@ Maybe<int> ParseTxtReply(Environment* env,
     // Each TXT record is a chunk consisting of one or more character-strings.
     LocalVector<Value> chunks(env->isolate());
     size_t str_count = ares_dns_rr_get_abin_cnt(rr, ARES_RR_TXT_DATA);
+    chunks.reserve(str_count);
     for (size_t j = 0; j < str_count; j++) {
       size_t str_len = 0;
       const unsigned char* str =