diff --git a/Lib/decimal.py b/Lib/decimal.py
index c3dffa3..5a9f840 100644
--- a/Lib/decimal.py
+++ b/Lib/decimal.py
@@ -957,7 +957,8 @@
         else:
             exp_hash = pow(_PyHASH_10INV, -self._exp, _PyHASH_MODULUS)
         hash_ = int(self._int) * exp_hash % _PyHASH_MODULUS
-        return hash_ if self >= 0 else -hash_
+        ans = hash_ if self >= 0 else -hash_
+        return -2 if ans == -1 else ans
 
     def as_tuple(self):
         """Represents the number as a triple tuple.