diff --git a/unisportomat/quiz/serializers.py b/unisportomat/quiz/serializers.py
index 48c9443dcffc85870c086a3b0ec6f9bbda888973..46c5f5ab77ff92ad033922040782451637ee8b30 100644
--- a/unisportomat/quiz/serializers.py
+++ b/unisportomat/quiz/serializers.py
@@ -12,7 +12,7 @@ class SportListSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = Sport
-        fields = ("id", "name", "url", "criteria_ratings")
+        fields = ("pk", "name", "url", "criteria_ratings")
 
 
 class QuestionListSerializer(serializers.ModelSerializer):
@@ -23,7 +23,7 @@ class QuestionListSerializer(serializers.ModelSerializer):
     class Meta:
         model = Question
 
-        fields = ("text", "criterion")
+        fields = ("pk", "text", "criterion")
 
 
 class CriterionListSerializer(serializers.ModelSerializer):
@@ -33,4 +33,4 @@ class CriterionListSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = Criterion
-        fields = ("id", "name")
+        fields = ("pk", "name")