diff --git a/Lib/decimal.py b/Lib/decimal.py
index b74ab01..746b34a 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -2596,7 +2596,7 @@
         ans = ans._fix(context)
         return ans
 
-    def same_quantum(self, other):
+    def same_quantum(self, other, context=None):
         """Return True if self and other have the same exponent; otherwise
         return False.
 
@@ -2914,7 +2914,7 @@
         except TypeError:
             return 0
 
-    def canonical(self, context=None):
+    def canonical(self):
         """Returns the same Decimal object.
 
         As we do not have different encodings for the same number, the
@@ -2934,7 +2934,7 @@
             return ans
         return self.compare(other, context=context)
 
-    def compare_total(self, other):
+    def compare_total(self, other, context=None):
         """Compares self to other using the abstract representations.
 
         This is not like the standard compare, which use their numerical
@@ -3007,7 +3007,7 @@
         return _Zero
 
 
-    def compare_total_mag(self, other):
+    def compare_total_mag(self, other, context=None):
         """Compares self to other using abstract repr., ignoring sign.
 
         Like compare_total, but with operand's sign ignored and assumed to be 0.
@@ -3029,7 +3029,7 @@
         else:
             return _dec_from_triple(1, self._int, self._exp, self._is_special)
 
-    def copy_sign(self, other):
+    def copy_sign(self, other, context=None):
         """Returns self with the sign of other."""
         other = _convert_other(other, raiseit=True)
         return _dec_from_triple(other._sign, self._int,
@@ -4182,7 +4182,7 @@
         """
         if not isinstance(a, Decimal):
             raise TypeError("canonical requires a Decimal as an argument.")
-        return a.canonical(context=self)
+        return a.canonical()
 
     def compare(self, a, b):
         """Compares values numerically.