diff --git a/src/agora/io/signal.py b/src/agora/io/signal.py
index 2578b57cfee9668c45e5b834ed3d8577b3cca4fc..17b2efccf8f9780257bcaed62f68984f68963f20 100644
--- a/src/agora/io/signal.py
+++ b/src/agora/io/signal.py
@@ -84,7 +84,7 @@ class Signal(BridgeH5):
         try:
             df.columns = (df.columns * self.tinterval // 60).astype(int)
         except Exception as e:
-            self._log(f"Unable to convert columns to minutes: {e}")
+            self._log(f"Unable to convert columns to minutes: {e}", "debug")
         return df
 
     @cached_property