diff --git a/src/api-engine/api/routes/channel/serializers.py b/src/api-engine/api/routes/channel/serializers.py
index ebc3eba21..165c12b65 100644
--- a/src/api-engine/api/routes/channel/serializers.py
+++ b/src/api-engine/api/routes/channel/serializers.py
@@ -29,12 +29,18 @@ class ChannelIDSerializer(serializers.Serializer):
     id = serializers.UUIDField(help_text="Channel ID")
 
 
+ORG_CHOICES = (
+    ("Application", "Application"),
+    ("Orderer", "Orderer"),
+)
+
+
 class ChannelUpdateSerializer(serializers.Serializer):
     msp_id = serializers.CharField(
         max_length=128, help_text="MSP ID of Organization")
     data = serializers.FileField(help_text="Channel config file")
-    org_type = serializers.CharField(
-        max_length=24, help_text="Organization type")
+    org_type = serializers.ChoiceField(
+        help_text="Organization type", choices=ORG_CHOICES)
 
 
 class ChannelOrgListSerializer(serializers.Serializer):