diff --git a/tools/wptrunner/wptrunner/executors/executormarionette.py b/tools/wptrunner/wptrunner/executors/executormarionette.py
index a5bf61d4053a0d..0362db83ee1678 100644
--- a/tools/wptrunner/wptrunner/executors/executormarionette.py
+++ b/tools/wptrunner/wptrunner/executors/executormarionette.py
@@ -45,6 +45,7 @@
                        PrintProtocolPart,
                        DebugProtocolPart,
                        VirtualSensorProtocolPart,
+                       DevicePostureProtocolPart,
                        merge_dicts)
 
 
@@ -745,6 +746,17 @@ def get_virtual_sensor_information(self, information_parameters):
         raise NotImplementedError("get_virtual_sensor_information not yet implemented")
 
 
+class MarionetteDevicePostureProtocolPart(DevicePostureProtocolPart):
+    def setup(self):
+        self.marionette = self.parent.marionette
+
+    def set_device_posture(self, posture):
+        raise NotImplementedError("set_device_posture not yet implemented")
+
+    def clear_device_posture(self):
+        raise NotImplementedError("clear_device_posture not yet implemented")
+
+
 class MarionetteProtocol(Protocol):
     implements = [MarionetteBaseProtocolPart,
                   MarionetteTestharnessProtocolPart,
@@ -765,7 +777,8 @@ class MarionetteProtocol(Protocol):
                   MarionettePrintProtocolPart,
                   MarionetteDebugProtocolPart,
                   MarionetteAccessibilityProtocolPart,
-                  MarionetteVirtualSensorProtocolPart]
+                  MarionetteVirtualSensorProtocolPart,
+                  MarionetteDevicePostureProtocolPart]
 
     def __init__(self, executor, browser, capabilities=None, timeout_multiplier=1, e10s=True, ccov=False):
         do_delayed_imports()