diff --git a/code/API_definitions/device-identifier.yaml b/code/API_definitions/device-identifier.yaml
index 0ec551f..7f12bdb 100644
--- a/code/API_definitions/device-identifier.yaml
+++ b/code/API_definitions/device-identifier.yaml
@@ -289,7 +289,7 @@ paths:
     post:
       summary: Get a pseudonymous identifier for device being used by a given mobile subscriber
       description: Get a pseudonymous identifier for device being used by a given mobile subscriber
-      operationId: retrievePPID
+      operationId: retrievePpid
       tags:
         - Get Device Identifiers
       security:
@@ -465,7 +465,7 @@ components:
               - ppid
             allOf:
               - $ref: "#/components/schemas/CommonResponseBody"
-              - $ref: "#/components/schemas/DevicePPID"
+              - $ref: "#/components/schemas/DevicePpid"
           examples:
             Successful PPID Retrieval:
               description: Device PPID has been successfully retrieved when the device subcsription was identified by a 3-legged access token or single device subscription identifier
@@ -691,7 +691,7 @@ components:
           description: Manufacturer of the device
           example: "Nokia"
 
-    DevicePPID:
+    DevicePpid:
       description: |
         The individual physical mobile device identifier, expressed as a PPID (Pairwise Pseudonymous Identifier)
       type: object