diff --git a/saqc/lib/ts_operators.py b/saqc/lib/ts_operators.py
index 54069a7baa48056d24a6bd5eb267afa6ca4afad9..91f41281dc1e480ce359f79b5934f4c2c367c443 100644
--- a/saqc/lib/ts_operators.py
+++ b/saqc/lib/ts_operators.py
@@ -374,7 +374,7 @@ def interpolateNANs(
             **{
                 "order": order,
                 "method": method,
-                "downgrade_inerpolation": downgrade_interpolation,
+                "downgrade_interpolation": downgrade_interpolation,
             },
         )
     # finally reinsert the dropped data gaps