diff --git a/infra/specs/internal.client.webrtc.json b/infra/specs/internal.client.webrtc.json
index a3d758295b..397bcecb1f 100644
--- a/infra/specs/internal.client.webrtc.json
+++ b/infra/specs/internal.client.webrtc.json
@@ -444,6 +444,7 @@
             }
           ],
           "dimensions": {
+            "cpu": "arm64",
             "device_status": "available",
             "id": "mac-438-e504",
             "os": "iOS-17.4.1",
diff --git a/infra/specs/mixins.pyl b/infra/specs/mixins.pyl
index 5e9f9badf1..9f124fdbb8 100644
--- a/infra/specs/mixins.pyl
+++ b/infra/specs/mixins.pyl
@@ -18,6 +18,13 @@
       }
     }
   },
+  'arm64': {
+    'swarming': {
+      'dimensions': {
+        'cpu': 'arm64'
+      }
+    }
+  },
   'chrome-tester-service-account': {
     'swarming': {
       'service_account':
diff --git a/infra/specs/waterfalls.pyl b/infra/specs/waterfalls.pyl
index 0248ac0afa..58576ffe54 100644
--- a/infra/specs/waterfalls.pyl
+++ b/infra/specs/waterfalls.pyl
@@ -332,7 +332,7 @@
       },
       'iOS64 Perf': {
         'mixins': [
-          'ios-device-perf', 'webrtc-xctest', 'timeout-3h',
+          'arm64', 'ios-device-perf', 'webrtc-xctest', 'timeout-3h',
           'chrome-tester-service-account', 'xcode_15_main', 'mac_toolchain',
           'has_native_resultdb_integration', 'out_dir_arg'
         ],