diff --git a/cura/PrinterOutput/GenericOutputController.py b/cura/PrinterOutput/GenericOutputController.py
index 45669ca08a..bfa3cfbc82 100644
--- a/cura/PrinterOutput/GenericOutputController.py
+++ b/cura/PrinterOutput/GenericOutputController.py
@@ -164,5 +164,5 @@ class GenericOutputController(PrinterOutputController):
             self._preheat_hotends_timer.stop()
 
         if self._preheat_bed_timer.isActive():
-            self._active_printer.updateIsPreheating(False)
+            self._preheat_printer.updateIsPreheating(False)
             self._preheat_bed_timer.stop()
diff --git a/plugins/USBPrinting/USBPrinterOutputDevice.py b/plugins/USBPrinting/USBPrinterOutputDevice.py
index 74952ece6e..74c24e2fca 100644
--- a/plugins/USBPrinting/USBPrinterOutputDevice.py
+++ b/plugins/USBPrinting/USBPrinterOutputDevice.py
@@ -97,7 +97,7 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
             return  # Aleady printing
 
         # cancel any ongoing preheat timer before starting a print
-        self._printers[0].stopPreheatTimers()
+        self._printers[0].getController().stopPreheatTimers()
 
         Application.getInstance().getController().setActiveStage("MonitorStage")