diff --git a/tools/config.py b/tools/config.py
index 8ed96964ae..66b1035036 100644
--- a/tools/config.py
+++ b/tools/config.py
@@ -226,6 +226,11 @@ class Config:
                 for attr in Target._Target__cumulative_attributes:
                     attrs = getattr(self.target_instance, attr)
 
+                    if attr in overrides:
+                        del attrs[:]
+                        attrs.extend(overrides[attr])
+                        del overrides[attr]
+
                     if attr+'_add' in overrides:
                         attrs.extend(overrides[attr+'_add'])
                         del overrides[attr+'_add']