diff --git a/devito/types/basic.py b/devito/types/basic.py
index 3d3241f27d..b63115f1d7 100644
--- a/devito/types/basic.py
+++ b/devito/types/basic.py
@@ -297,7 +297,7 @@ def bound_symbols(self):
         return set()
 
 
-class AbstractSymbol(sympy.Symbol, Basic, Pickable, Evaluable):
+class AbstractSymbol(sympy.Symbol, Basic, Pickable, Evaluable, ArgProvider):
 
     """
     Base class for scalar symbols.
@@ -549,7 +549,7 @@ def __new__(cls, *args, **kwargs):
     __hash__ = Uncached.__hash__
 
 
-class Scalar(Symbol, ArgProvider):
+class Scalar(Symbol):
 
     """
     Like a Symbol, but in addition it can pass runtime values to an Operator.
diff --git a/devito/types/dimension.py b/devito/types/dimension.py
index 7e1f7fc811..784dde499e 100644
--- a/devito/types/dimension.py
+++ b/devito/types/dimension.py
@@ -570,9 +570,6 @@ def local(self):
     def value(self):
         return self._value
 
-    def _arg_check(self, *args, **kwargs):
-        pass
-
     def _arg_values(self, grid=None, **kwargs):
         # Allow override of thickness values to disable BCs
         # However, arguments from the user are considered global
@@ -597,12 +594,6 @@ def _arg_values(self, grid=None, **kwargs):
 
         return {self.name: tkn}
 
-    def _arg_finalize(self, *args, **kwargs):
-        return {}
-
-    def _arg_apply(self, *args, **kwargs):
-        pass
-
 
 class AbstractSubDimension(DerivedDimension):