diff --git a/server/basicknowledge/queries.py b/server/basicknowledge/queries.py
index 8304d3e0..38bf75a8 100644
--- a/server/basicknowledge/queries.py
+++ b/server/basicknowledge/queries.py
@@ -64,4 +64,4 @@ class InstrumentQuery(object):
         return BasicKnowledge.objects.all().live()
 
     def resolve_instrument_types(self, info, **kwargs):
-        return InstrumentType.objects.filter(instruments__isnull=False)
+        return InstrumentType.objects.filter(instruments__isnull=False).distinct()
diff --git a/server/basicknowledge/tests/test_instrument_types_query.py b/server/basicknowledge/tests/test_instrument_types_query.py
index d90b3f4e..1073b01e 100644
--- a/server/basicknowledge/tests/test_instrument_types_query.py
+++ b/server/basicknowledge/tests/test_instrument_types_query.py
@@ -20,6 +20,10 @@ class InstrumentTypesQueryTestCase(SkillboxTestCase):
         InstrumentTypeFactory(name='Guitar')
         self.instrument = InstrumentFactory(new_type=self.type)
         InstrumentFactory(new_type=second_type)
+        InstrumentFactory(new_type=second_type)
+        InstrumentFactory(new_type=second_type)
+        InstrumentFactory(new_type=second_type)
+        InstrumentFactory(new_type=second_type)
 
     def test_instrument_types_empty_not_returned(self):
         result = self.get_client().get_result(INSTRUMENT_TYPES_QUERY)