diff --git a/lib/bitcoin/hd-accounts-service.js b/lib/bitcoin/hd-accounts-service.js
index 63c3307..4de9787 100644
--- a/lib/bitcoin/hd-accounts-service.js
+++ b/lib/bitcoin/hd-accounts-service.js
@@ -144,10 +144,7 @@ class HDAccountsService {
     const externalPrm = hdaHelper.deriveAddresses(xpub, 0, _.range(gap.external), scheme)
     const internalPrm = hdaHelper.deriveAddresses(xpub, 1, _.range(gap.internal), scheme)
 
-    const external = await externalPrm
-    const internal = await internalPrm
-
-    const addresses = _.flatten([external, internal])
+    const addresses = _.flatten(await Promise.all([externalPrm, internalPrm]))
 
     return db.addAddressesToHDAccount(xpub, addresses)
   }