diff --git a/lib/runBlockchain.ts b/lib/runBlockchain.ts
index 7dc43f22eb2..e7bfc46d41d 100644
--- a/lib/runBlockchain.ts
+++ b/lib/runBlockchain.ts
@@ -104,7 +104,11 @@ interface hasGenesisStateCallback {
  * Checks whether the current instance has the canonical genesis state
  * for the configured chain parameters.
  */
-function hasGenesisState(stateManager: StateManager, common: Common, cb: hasGenesisStateCallback): void {
+function hasGenesisState(
+  stateManager: StateManager,
+  common: Common,
+  cb: hasGenesisStateCallback,
+): void {
   const root = common.genesis().stateRoot
   stateManager._trie.checkRoot(root, cb)
 }