diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index b02d3473..622d288 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -2266,6 +2266,36 @@
 		finally:
 			self._dynamic_config._autounmask = _autounmask_backup
 
+	def _ignore_dependency(self, atom, pkg, child, dep, mypriority, recurse_satisfied):
+		"""
+		In some cases, dep_check will return deps that shouldn't
+		be proccessed any further, so they are identified and
+		discarded here. Try to discard as few as possible since
+		discarded dependencies reduce the amount of information
+		available for optimization of merge order.
+		Don't ignore dependencies if pkg has a slot operator dependency on the child
+		and the child has changed slot/sub_slot.
+		"""
+		slot_operator_rebuild = False
+		if atom.slot_operator == '=' and \
+			(pkg.root, pkg.slot_atom) in self._dynamic_config._slot_operator_replace_installed and \
+			mypriority.satisfied and \
+			mypriority.satisfied is not child and \
+			mypriority.satisfied.installed and \
+			not child.installed and \
+			(child.slot != mypriority.satisfied.slot or child.sub_slot != mypriority.satisfied.sub_slot):
+			slot_operator_rebuild = True
+
+		return not atom.blocker and \
+			not recurse_satisfied and \
+			mypriority.satisfied and \
+			mypriority.satisfied.visible and \
+			dep.child is not None and \
+			not dep.child.installed and \
+			self._dynamic_config._slot_pkg_map[dep.child.root].get(
+			dep.child.slot_atom) is None and \
+			not slot_operator_rebuild
+
 	def _wrapped_add_pkg_dep_string(self, pkg, dep_root, dep_priority,
 		dep_string, allow_unsatisfied):
 		depth = pkg.depth + 1
@@ -2355,14 +2385,7 @@
 			# discarded dependencies reduce the amount of information
 			# available for optimization of merge order.
 			ignored = False
-			if not atom.blocker and \
-				not recurse_satisfied and \
-				mypriority.satisfied and \
-				mypriority.satisfied.visible and \
-				dep.child is not None and \
-				not dep.child.installed and \
-				self._dynamic_config._slot_pkg_map[dep.child.root].get(
-				dep.child.slot_atom) is None:
+			if self._ignore_dependency(atom, pkg, child, dep, mypriority, recurse_satisfied):
 				myarg = None
 				try:
 					myarg = next(self._iter_atoms_for_pkg(dep.child), None)
@@ -2465,14 +2488,7 @@
 					collapsed_parent=pkg, collapsed_priority=dep_priority)
 
 				ignored = False
-				if not atom.blocker and \
-					not recurse_satisfied and \
-					mypriority.satisfied and \
-					mypriority.satisfied.visible and \
-					dep.child is not None and \
-					not dep.child.installed and \
-					self._dynamic_config._slot_pkg_map[dep.child.root].get(
-					dep.child.slot_atom) is None:
+				if self._ignore_dependency(atom, pkg, child, dep, mypriority, recurse_satisfied):
 					myarg = None
 					try:
 						myarg = next(self._iter_atoms_for_pkg(dep.child), None)
diff --git a/pym/portage/tests/resolver/test_slot_conflict_rebuild.py b/pym/portage/tests/resolver/test_slot_conflict_rebuild.py
index 74f5cc1..e3c517d 100644
--- a/pym/portage/tests/resolver/test_slot_conflict_rebuild.py
+++ b/pym/portage/tests/resolver/test_slot_conflict_rebuild.py
@@ -181,6 +181,69 @@
 		finally:
 			playground.cleanup()
 
+	def testSlotConflictForgottenChild(self):
+		"""
+		Similar to testSlotConflictMassRebuild above, but this time the rebuilds are scheduled,
+		but the package causing the rebuild (the child) is not installed.
+		"""
+		ebuilds = {
+
+			"app-misc/A-2" : {
+				"EAPI": "5",
+				"DEPEND": "app-misc/B:= app-misc/C",
+				"RDEPEND": "app-misc/B:= app-misc/C",
+			},
+
+			"app-misc/B-2" : {
+				"EAPI": "5",
+				"SLOT": "2"
+			},
+
+			"app-misc/C-1": {
+				"EAPI": "5",
+				"DEPEND": "app-misc/B:=",
+				"RDEPEND": "app-misc/B:="
+			},
+		}
+
+		installed = {
+			"app-misc/A-1" : {
+				"EAPI": "5",
+				"DEPEND": "app-misc/B:1/1= app-misc/C",
+				"RDEPEND": "app-misc/B:1/1= app-misc/C",
+			},
+
+			"app-misc/B-1" : {
+				"EAPI": "5",
+				"SLOT": "1"
+			},
+
+			"app-misc/C-1": {
+				"EAPI": "5",
+				"DEPEND": "app-misc/B:1/1=",
+				"RDEPEND": "app-misc/B:1/1="
+			},
+		}
+
+		test_cases = (
+			ResolverPlaygroundTestCase(
+				["app-misc/A"],
+				success = True,
+				mergelist = ['app-misc/B-2', 'app-misc/C-1', 'app-misc/A-2']),
+		)
+
+		world = []
+
+		playground = ResolverPlayground(ebuilds=ebuilds,
+			installed=installed, world=world, debug=False)
+		try:
+			for test_case in test_cases:
+				playground.run_TestCase(test_case)
+				self.assertEqual(test_case.test_success, True, test_case.fail_msg)
+		finally:
+			playground.cleanup()
+
+
 	def testSlotConflictDepChange(self):
 		"""
 		Bug 490362