diff --git a/saqc/funcs/proc_functions.py b/saqc/funcs/proc_functions.py
index 511f77865a08c601288febb7d1c9b6b339d95b81..8f004ff4e3726e87517ab18d2b313742fd370ecc 100644
--- a/saqc/funcs/proc_functions.py
+++ b/saqc/funcs/proc_functions.py
@@ -8,7 +8,7 @@ from saqc.lib.ts_operators import interpolateNANs, validationTrafo
 from saqc.lib.tools import composeFunction
 
 @register()
-def proc_interpolateMissing(data, field, method, inter_order=2, inter_limit=2, interpol_flag='UNFLAGGED',
+def proc_interpolateMissing(data, field, flagger, method, inter_order=2, inter_limit=2, interpol_flag='UNFLAGGED',
                             downgrade_interpolation=False, return_chunk_bounds=False, **kwargs):
 
     inter_data = interpolateNANs(data[field], method, order=inter_order, inter_limit=inter_limit,