diff --git a/cura/Machines/MachineNode.py b/cura/Machines/MachineNode.py
index 5e89dfc24d..80cb983daf 100644
--- a/cura/Machines/MachineNode.py
+++ b/cura/Machines/MachineNode.py
@@ -152,8 +152,8 @@ class MachineNode(ContainerNode):
                 self.variants["empty"] = VariantNode("empty_variant", machine = self)
 
         # Find the global qualities for this printer.
-        global_qualities = container_registry.findInstanceContainersMetadata(type = "quality", definition = self.quality_definition, global_quality = True)  # First try specific to this printer.
+        global_qualities = container_registry.findInstanceContainersMetadata(type = "quality", definition = self.quality_definition, global_quality = "True")  # First try specific to this printer.
         if len(global_qualities) == 0:  # This printer doesn't override the global qualities.
-            global_qualities = container_registry.findInstanceContainersMetadata(type = "quality", definition = "fdmprinter", global_quality = True)  # Otherwise pick the global global qualities.
+            global_qualities = container_registry.findInstanceContainersMetadata(type = "quality", definition = "fdmprinter", global_quality = "True")  # Otherwise pick the global global qualities.
         for global_quality in global_qualities:
             self.global_qualities[global_quality["quality_type"]] = QualityNode(global_quality["id"], parent = self)
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