diff --git a/src/OT/Color/COLR/COLR.hh b/src/OT/Color/COLR/COLR.hh
index d45dc4f..47b6c0b 100644
--- a/src/OT/Color/COLR/COLR.hh
+++ b/src/OT/Color/COLR/COLR.hh
@@ -1968,7 +1968,7 @@
     colr_prime->layerList.serialize_subset (c, layerList, this);
     colr_prime->clipList.serialize_subset (c, clipList, this);
     colr_prime->varIdxMap.serialize_copy (c->serializer, varIdxMap, this);
-    //TODO: subset varStore once it's implemented in fonttools
+    colr_prime->varStore.serialize_copy (c->serializer, varStore, this);
     return_trace (true);
   }
 
diff --git a/src/hb-ot-layout-common.hh b/src/hb-ot-layout-common.hh
index dbdd7dd..b53f2e9 100644
--- a/src/hb-ot-layout-common.hh
+++ b/src/hb-ot-layout-common.hh
@@ -2353,6 +2353,9 @@
 
 struct VarData
 {
+  unsigned int get_item_count () const
+  { return itemCount; }
+
   unsigned int get_region_index_count () const
   { return regionIndices.len; }
 
@@ -2758,6 +2761,29 @@
     return_trace (true);
   }
 
+  VariationStore *copy (hb_serialize_context_t *c) const
+  {
+    TRACE_SERIALIZE (this);
+    auto *out = c->start_embed (this);
+    if (unlikely (!out)) return_trace (nullptr);
+
+    hb_vector_t <hb_inc_bimap_t> inner_maps;
+    unsigned count = dataSets.len;
+    for (unsigned i = 0; i < count; i++)
+    {
+      hb_inc_bimap_t *map = inner_maps.push ();
+      auto &data = this+dataSets[i];
+
+      unsigned itemCount = data.get_item_count ();
+      for (unsigned j = 0; j < itemCount; j++)
+	map->add (j);
+    }
+
+    if (unlikely (!out->serialize (c, this, inner_maps))) return_trace (nullptr);
+
+    return_trace (out);
+  }
+
   bool subset (hb_subset_context_t *c, const hb_array_t<const hb_inc_bimap_t> &inner_maps) const
   {
     TRACE_SUBSET (this);