diff --git a/core/exchange_test.go b/core/exchange_test.go
index c0b925b51d..072493d4f3 100644
--- a/core/exchange_test.go
+++ b/core/exchange_test.go
@@ -135,7 +135,7 @@ func fillBlocks(
 		default:
 		}
 
-		_, err := cctx.FillBlock(16, cfg.Genesis.Accounts()[0].Name, flags.BroadcastBlock)
+		_, err := cctx.FillBlock(16, cfg.Genesis.Accounts()[0].Name, flags.BroadcastAsync)
 		require.NoError(t, err)
 	}
 }