diff --git a/src/cryptography/x509/extensions.py b/src/cryptography/x509/extensions.py
index 4dee72f..ed29b54 100644
--- a/src/cryptography/x509/extensions.py
+++ b/src/cryptography/x509/extensions.py
@@ -1019,6 +1019,9 @@
     def __ne__(self, other):
         return not self == other
 
+    def __hash__(self):
+        return hash(self.reason)
+
     reason = utils.read_only_property("_reason")
 
 
diff --git a/tests/test_x509_ext.py b/tests/test_x509_ext.py
index 67081b2..8f961b0 100644
--- a/tests/test_x509_ext.py
+++ b/tests/test_x509_ext.py
@@ -140,6 +140,14 @@
         assert reason1 != reason2
         assert reason1 != object()
 
+    def test_hash(self):
+        reason1 = x509.CRLReason(x509.ReasonFlags.unspecified)
+        reason2 = x509.CRLReason(x509.ReasonFlags.unspecified)
+        reason3 = x509.CRLReason(x509.ReasonFlags.ca_compromise)
+
+        assert hash(reason1) == hash(reason2)
+        assert hash(reason1) != hash(reason3)
+
     def test_repr(self):
         reason1 = x509.CRLReason(x509.ReasonFlags.unspecified)
         assert repr(reason1) == (