diff --git a/plugins/GCodeReader/FlavorParser.py b/plugins/GCodeReader/FlavorParser.py
index 372ee831356..74dbeadec09 100644
--- a/plugins/GCodeReader/FlavorParser.py
+++ b/plugins/GCodeReader/FlavorParser.py
@@ -298,8 +298,14 @@ def processTCode(self, global_stack, T: int, line: str, position: Position, path
             position.e.extend([0] * (self._extruder_number - len(position.e) + 1))
         return position
 
-    def processMCode(self, M: int, line: str, position: Position, path: List[List[Union[float, int]]]) -> Position:
-        pass
+    def processMCode(self, M: int, line: str, position: Position, path: List[List[Union[float, int]]]) -> None:
+        # Set extrusion mode
+        if M == 82:
+            # Set absolute extrusion mode
+            self._is_absolute_extrusion = True
+        elif M == 83:
+            # Set relative extrusion mode
+            self._is_absolute_extrusion = False
 
     _type_keyword = ";TYPE:"
     _layer_keyword = ";LAYER:"
diff --git a/plugins/GCodeReader/RepRapFlavorParser.py b/plugins/GCodeReader/RepRapFlavorParser.py
index 10b7b785876..1a80412238e 100644
--- a/plugins/GCodeReader/RepRapFlavorParser.py
+++ b/plugins/GCodeReader/RepRapFlavorParser.py
@@ -11,14 +11,6 @@ class RepRapFlavorParser(FlavorParser.FlavorParser):
     def __init__(self):
         super().__init__()
 
-    def processMCode(self, M, line, position, path):
-        if M == 82:
-            # Set absolute extrusion mode
-            self._is_absolute_extrusion = True
-        elif M == 83:
-            # Set relative extrusion mode
-            self._is_absolute_extrusion = False
-
     def _gCode90(self, position, params, path):
         """Set the absolute positioning