diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index 5b715230e2..a726e239e0 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -174,18 +174,19 @@ class StartSliceJob(Job):
     def _buildExtruderMessage(self, stack):
         message = self._slice_message.addRepeatedMessage("extruders")
         message.id = int(stack.getMetaDataEntry("position"))
+
+        material_instance_container = stack.findContainer({"type": "material"})
+
         for key in stack.getAllKeys():
             setting = message.getMessage("settings").addRepeatedMessage("settings")
             setting.name = key
-            setting.value = str(stack.getProperty(key, "value")).encode("utf-8")
+            if key == "material_guid" and material_instance_container:
+                # Also send the material GUID. This is a setting in fdmprinter, but we have no interface for it.
+                setting.value = str(material_instance_container.getMetaDataEntry("GUID", "")).encode("utf-8")
+            else:
+                setting.value = str(stack.getProperty(key, "value")).encode("utf-8")
             Job.yieldThread()
 
-        # ALso send the material GUID as a setting.
-        material_instance_container = stack.findContainer({"type": "material"})
-        if material_instance_container:
-            setting = message.getMessage("settings").addRepeatedMessage("settings")
-            setting.name = "material_GUID"
-            setting.value = str(material_instance_container.getMetaDataEntry("GUID", "")).encode("utf-8")
     ##  Sends all global settings to the engine.
     #
     #   The settings are taken from the global stack. This does not include any
diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index 8833c175f3..c54b8e85f4 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -57,6 +57,14 @@
                     "settable_per_extruder": false,
                     "settable_per_meshgroup": false
                 },
+                "material_guid":
+                {
+                    "label": "Material GUID",
+                    "description": "GUID of the material. This is set automatically. ",
+                    "default_value": "",
+                    "type": "str",
+                    "enabled": false
+                },
                 "material_bed_temp_wait":
                 {
                     "label": "Wait for bed heatup",