diff --git a/jc/parsers/x509_cert.py b/jc/parsers/x509_cert.py
index 691bb837..92164e4e 100644
--- a/jc/parsers/x509_cert.py
+++ b/jc/parsers/x509_cert.py
@@ -244,7 +244,7 @@ def _fix_objects(obj):
     into JSON serializable types.
     """
     if isinstance(obj, set):
-        obj = list(obj)
+        obj = sorted(list(obj))
 
     if isinstance(obj, OrderedDict):
         obj = dict(obj)
@@ -271,7 +271,7 @@ def _fix_objects(obj):
                 continue
 
             if isinstance(v, set):
-                v = list(v)
+                v = sorted(list(v))
                 obj.update({k: v})
 
             if isinstance(v, OrderedDict):