diff --git a/senpy/extensions.py b/senpy/extensions.py
index e30fa14..9326adb 100644
--- a/senpy/extensions.py
+++ b/senpy/extensions.py
@@ -195,7 +195,7 @@ class Senpy(object):
 
     def convert_emotions(self, resp, plugins, params):
         """
-        Conversion of all emotions in a response.
+        Conversion of all emotions in a response **in place**.
         In addition to converting from one model to another, it has
         to include the conversion plugin to the analysis list.
         Needless to say, this is far from an elegant solution, but it works.
@@ -220,7 +220,6 @@ class Senpy(object):
                 e.parameters = params
                 raise e
         newentries = []
-        resp.analysis = set(resp.analysis)
         for i in resp.entries:
             if output == "full":
                 newemotions = copy.deepcopy(i.emotions)
@@ -229,7 +228,7 @@ class Senpy(object):
             for j in i.emotions:
                 plugname = j['prov:wasGeneratedBy']
                 candidate = candidates[plugname]
-                resp.analysis.add(candidate.id)
+                resp.analysis.append(candidate.id)
                 for k in candidate.convert(j, fromModel, toModel, params):
                     k.prov__wasGeneratedBy = candidate.id
                     if output == 'nested':
@@ -238,6 +237,7 @@ class Senpy(object):
             i.emotions = newemotions
             newentries.append(i)
         resp.entries = newentries
+        resp.analysis = list(set(resp.analysis))
 
     @property
     def default_plugin(self):
diff --git a/tests/test_extensions.py b/tests/test_extensions.py
index 067f697..9293fde 100644
--- a/tests/test_extensions.py
+++ b/tests/test_extensions.py
@@ -205,6 +205,7 @@ class ExtensionsTest(TestCase):
                                     [plugin, ],
                                     params)
         assert len(r3.entries[0].emotions) == 1
+        r3.jsonld()
 
     # def test_async_plugin(self):
     #     """ We should accept multiprocessing plugins with async=False"""