diff --git a/scripts/build/build/target.py b/scripts/build/build/target.py
index ac67ed38c4c555..8411ff9432c2c7 100644
--- a/scripts/build/build/target.py
+++ b/scripts/build/build/target.py
@@ -319,7 +319,7 @@ def ToDict(self):
         return {
             'name': self.name,
             'shorthand': self.HumanString(),
-            'parts': [part.ToDict() for target in self.fixed_targets for part in target],
+            'parts': [[part.ToDict() for part in target] for target in self.fixed_targets],
             'modifiers': [part.ToDict() for part in self.modifiers]
         }