diff --git a/saqc/lib/ts_operators.py b/saqc/lib/ts_operators.py
index 56e7a906b4fd99026345a3dee58bdc0d0c3a6c73..d11de8c84b1efbf22bc420da9cf19a3839ee608a 100644
--- a/saqc/lib/ts_operators.py
+++ b/saqc/lib/ts_operators.py
@@ -116,7 +116,7 @@ def validationTrafo(data, max_nan_total, max_nan_consec):
     if nan_mask.sum() <= max_nan_total:
         if max_nan_consec is np.inf:
             return data
-        elif _max_consecutive_nan(np.asarray(nan_mask),max_nan_consec):
+        elif _max_consecutive_nan(np.asarray(nan_mask), max_nan_consec):
             return data
         else:
             data[:] = np.nan