diff --git a/slic/utils/argfwd.py b/slic/utils/argfwd.py
index b53ee697c..abc79015f 100644
--- a/slic/utils/argfwd.py
+++ b/slic/utils/argfwd.py
@@ -27,10 +27,9 @@ def forwards_to(func_inner, nfilled=0, appended_kwargs=None):
     return deco
 
 
-
+'''
 def get_args(func):
-    spec = inspect.signature(func)
-    #spec = inspect.getfullargspec(func) #TODO replace by inspect.signature?
+    spec = inspect.getfullargspec(func) #TODO replace by inspect.signature?
     all_args = spec.args
 
     defaults = spec.defaults or []
@@ -45,7 +44,23 @@ def get_args(func):
         kw.update(kwonly)
 
     return pos, kw
+'''
 
+def get_args(func):
+    sig = inspect.signature(func)
+    pos = []
+    kw = {}
+
+    for name, param in sig.parameters.items():
+        if param.kind in (inspect.Parameter.POSITIONAL_ONLY, inspect.Parameter.POSITIONAL_OR_KEYWORD):
+            if param.default is inspect._empty:
+                pos.append(name)
+            else:
+                kw[name] = param.default
+        elif param.kind == inspect.Parameter.KEYWORD_ONLY:
+            kw[name] = param.default if param.default is not inspect._empty else inspect._empty
+
+    return pos, kw
 
 def split_at(lst, index):
     return lst[:index], lst[index:]