diff --git a/metricbeat/module/system/test_system.py b/metricbeat/module/system/test_system.py
index dda6a0a6fddd..e4aa935a68cf 100644
--- a/metricbeat/module/system/test_system.py
+++ b/metricbeat/module/system/test_system.py
@@ -252,6 +252,7 @@ def test_diskio(self):
             if 'error' not in evt:
                 if "system" in evt:
                     diskio = evt["system"]["diskio"]
+                    self.remove_fields(diskio, ["serial_number"])
                     self.assert_fields_for_platform(SYSTEM_DISKIO, diskio)
                 elif "host" in evt:
                     host_disk = evt["host"]["disk"]
diff --git a/metricbeat/tests/system/metricbeat.py b/metricbeat/tests/system/metricbeat.py
index 123c9ad2bc0b..449536e4f398 100644
--- a/metricbeat/tests/system/metricbeat.py
+++ b/metricbeat/tests/system/metricbeat.py
@@ -136,6 +136,11 @@ def check_metricset(self, module, metricset, hosts, fields: list = None, extras:
 
         self.assert_fields_are_documented(evt)
 
+    def remove_fields(self, event: object, fields: list):
+        for field in fields:
+            if field in event:
+                del event[field]
+
 
 def supported_versions(path):
     """