@@ -, +, @@ 
---
 pym/_emerge/depgraph.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/pym/_emerge/depgraph.py	
+++ a/pym/_emerge/depgraph.py	
@@ -1540,7 +1540,8 @@ class depgraph(object):
 			slot operator parents.
 			"""
 			for parent, atom in self._dynamic_config._parent_atoms.get(existing_pkg, []):
-				if atom.slot_operator == "=" and parent.built:
+				if (atom.sub_slot is not None or atom.slot_operator == '=') \
+					and parent.built:
 					continue
 
 				atom_set = InternalPackageSet(initial_atoms=(atom,),
--