diff --git a/changelogs/application_service/newsfragments/1646.clarification b/changelogs/application_service/newsfragments/1646.clarification
new file mode 100644
index 00000000..7779bf73
--- /dev/null
+++ b/changelogs/application_service/newsfragments/1646.clarification
@@ -0,0 +1 @@
+Remove required `fieldname` in Protocol definition.
\ No newline at end of file
diff --git a/data/api/application-service/definitions/protocol.yaml b/data/api/application-service/definitions/protocol.yaml
index 801faed1..c442a1b1 100644
--- a/data/api/application-service/definitions/protocol.yaml
+++ b/data/api/application-service/definitions/protocol.yaml
@@ -63,7 +63,6 @@ properties:
           description: An placeholder serving as a valid example of the field value.
           type: string
       required: ['regexp', 'placeholder']
-    required: ['fieldname']
     example: {
       "network": {
         "regexp": "([a-z0-9]+\\.)*[a-z0-9]+",