diff --git a/hummingbot/connector/exchange/ascend_ex/ascend_ex_order_book_tracker.py b/hummingbot/connector/exchange/ascend_ex/ascend_ex_order_book_tracker.py
index 0801dd47be..e982f5c85b 100644
--- a/hummingbot/connector/exchange/ascend_ex/ascend_ex_order_book_tracker.py
+++ b/hummingbot/connector/exchange/ascend_ex/ascend_ex_order_book_tracker.py
@@ -85,8 +85,7 @@ async def _track_single_book(self, trading_pair: str):
                     # Output some statistics periodically.
                     now: float = time.time()
                     if int(now / 60.0) > int(last_message_timestamp / 60.0):
-                        self.logger().debug("Processed %d order book diffs for %s.",
-                                            diff_messages_accepted, trading_pair)
+                        self.logger().debug(f"Processed {diff_messages_accepted} order book diffs for {trading_pair}.")
                         diff_messages_accepted = 0
                     last_message_timestamp = now
                 elif message.type is OrderBookMessageType.SNAPSHOT:
@@ -100,7 +99,7 @@ async def _track_single_book(self, trading_pair: str):
                         d_bids, d_asks = active_order_tracker.convert_diff_message_to_order_book_row(diff_message)
                         order_book.apply_diffs(d_bids, d_asks, diff_message.update_id)
 
-                    self.logger().debug("Processed order book snapshot for %s.", trading_pair)
+                    self.logger().debug(f"Processed order book snapshot for {trading_pair}.")
             except asyncio.CancelledError:
                 raise
             except Exception: