diff --git a/piker/data/_source.py b/piker/data/_source.py
index 1a8c635d..46302508 100644
--- a/piker/data/_source.py
+++ b/piker/data/_source.py
@@ -106,6 +106,7 @@ class Symbol(BaseModel):
         mult = 1 / self.tick_size
         return round(value * mult) / mult
 
+
 @validate_arguments
 def mk_symbol(