diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index f8fb0667b9..c620d899b8 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4481,10 +4481,10 @@ void Heap::FinalizeIncrementalMarkingIfComplete(
 }
 
 void Heap::RegisterDeserializedObjectsForBlackAllocation(
-    Reservation* reservations, List<HeapObject*>* large_objects) {
-  // TODO(hpayer): We do not have to iterate reservations on black objects
-  // for marking. We just have to execute the special visiting side effect
-  // code that adds objects to global data structures, e.g. for array buffers.
+    Reservation* reservations, List<HeapObject*>* large_objects,
+    List<Address>* maps) {
+  // TODO(ulan): pause black allocation during deserialization to avoid
+  // iterating all these objects in one go.
 
   if (!incremental_marking()->black_allocation()) return;
 
@@ -4514,6 +4514,12 @@ void Heap::RegisterDeserializedObjectsForBlackAllocation(
   for (HeapObject* object : *large_objects) {
     incremental_marking()->ProcessBlackAllocatedObject(object);
   }
+
+  // Map space doesn't use reservations, so it needs custom handling.
+  for (Address addr : *maps) {
+    incremental_marking()->ProcessBlackAllocatedObject(
+        HeapObject::FromAddress(addr));
+  }
 }
 
 void Heap::NotifyObjectLayoutChange(HeapObject* object,
diff --git a/src/heap/heap.h b/src/heap/heap.h
index f33df448c0..65037d2821 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1184,7 +1184,8 @@ class Heap {
   void FinalizeIncrementalMarkingIfComplete(GarbageCollectionReason gc_reason);
 
   void RegisterDeserializedObjectsForBlackAllocation(
-      Reservation* reservations, List<HeapObject*>* large_objects);
+      Reservation* reservations, List<HeapObject*>* large_objects,
+      List<Address>* maps);
 
   IncrementalMarking* incremental_marking() { return incremental_marking_; }
 
diff --git a/src/snapshot/deserializer.cc b/src/snapshot/deserializer.cc
index a01fa67c88..a0c26aa4a2 100644
--- a/src/snapshot/deserializer.cc
+++ b/src/snapshot/deserializer.cc
@@ -153,7 +153,7 @@ MaybeHandle<Object> Deserializer::DeserializePartial(
   DeserializeEmbedderFields(embedder_fields_deserializer);
 
   isolate->heap()->RegisterDeserializedObjectsForBlackAllocation(
-      reservations_, &deserialized_large_objects_);
+      reservations_, &deserialized_large_objects_, &allocated_maps_);
 
   // There's no code deserialized here. If this assert fires then that's
   // changed and logging should be added to notify the profiler et al of the
@@ -181,7 +181,7 @@ MaybeHandle<HeapObject> Deserializer::DeserializeObject(Isolate* isolate) {
       FlushICacheForNewCodeObjectsAndRecordEmbeddedObjects();
       result = Handle<HeapObject>(HeapObject::cast(root));
       isolate->heap()->RegisterDeserializedObjectsForBlackAllocation(
-          reservations_, &deserialized_large_objects_);
+          reservations_, &deserialized_large_objects_, &allocated_maps_);
     }
     CommitPostProcessedObjects(isolate);
     return scope.CloseAndEscape(result);