diff --git a/klippy/kinematics/extruder.py b/klippy/kinematics/extruder.py
index e3303982..76f9c35e 100644
--- a/klippy/kinematics/extruder.py
+++ b/klippy/kinematics/extruder.py
@@ -81,6 +81,9 @@ class ExtruderStepper:
         extruder = self.printer.lookup_object('toolhead').get_extruder()
         if extruder.extruder_stepper is None:
             raise gcmd.error("Active extruder does not have a stepper")
+        strapq = extruder.extruder_stepper.stepper.get_trapq()
+        if strapq is not extruder.get_trapq():
+            raise gcmd.error("Unable to infer active extruder stepper")
         extruder.extruder_stepper.cmd_SET_PRESSURE_ADVANCE(gcmd)
     def cmd_SET_PRESSURE_ADVANCE(self, gcmd):
         pressure_advance = gcmd.get_float('ADVANCE', self.pressure_advance,
diff --git a/klippy/stepper.py b/klippy/stepper.py
index 304d7d82..ad7d1282 100644
--- a/klippy/stepper.py
+++ b/klippy/stepper.py
@@ -197,6 +197,8 @@ class MCU_stepper:
             raise error("Internal error in stepcompress")
         self._set_mcu_position(last_pos)
         self._mcu.get_printer().send_event("stepper:sync_mcu_position", self)
+    def get_trapq(self):
+        return self._trapq
     def set_trapq(self, tq):
         ffi_main, ffi_lib = chelper.get_ffi()
         if tq is None: