diff --git a/rest-api/resources/src/main/resources/openapi/device/device-scopeId-deviceId.yaml b/rest-api/resources/src/main/resources/openapi/device/device-scopeId-deviceId.yaml
index c617268b0c5..a8379d82ddb 100644
--- a/rest-api/resources/src/main/resources/openapi/device/device-scopeId-deviceId.yaml
+++ b/rest-api/resources/src/main/resources/openapi/device/device-scopeId-deviceId.yaml
@@ -55,7 +55,7 @@ paths:
               optlock: 1
               status: ENABLED
               displayName: Test Device
-              serialNumber: 1234567890
+              serialNumber: "1234567890"
               modelId: Test Model
               biosVersion: N/A
               firmwareVersion: N/A
diff --git a/rest-api/resources/src/main/resources/openapi/device/device.yaml b/rest-api/resources/src/main/resources/openapi/device/device.yaml
index 184822026f9..4147d9524ae 100644
--- a/rest-api/resources/src/main/resources/openapi/device/device.yaml
+++ b/rest-api/resources/src/main/resources/openapi/device/device.yaml
@@ -157,7 +157,7 @@ components:
         clientId: testDevice
         status: ENABLED
         displayName: Test Device
-        serialNumber: 1234567890
+        serialNumber: "1234567890"
         modelId: Test Model
         biosVersion: N/A
         firmwareVersion: N/A
@@ -238,7 +238,7 @@ components:
             clientId: testDevice
             status: ENABLED
             displayName: Test Device
-            serialNumber: 1234567890
+            serialNumber: "1234567890"
             modelId: Test Model
             biosVersion: N/A
             firmwareVersion: N/A