diff --git a/hardhat.config.js b/hardhat.config.js
index 48d83b9..c7c6f68 100644
--- a/hardhat.config.js
+++ b/hardhat.config.js
@@ -64,7 +64,11 @@ const config = {
     },
     rinkeby: {
       url: `https://rinkeby.infura.io/v3/${process.env.INFURA_API_KEY}`,
-      accounts: [process.env.PRIVATE_KEY],
+      accounts: process.env.PRIVATE_KEY
+        ? [process.env.PRIVATE_KEY]
+        : {
+            mnemonic: 'test test test test test test test test test test test junk',
+          },
     },
     xdai: {
       url: process.env.ETH_RPC || 'https://rpc.xdaichain.com/',