diff --git a/compiler/dex/ssa_transformation.cc b/compiler/dex/ssa_transformation.cc
index 7bf7a65..a2b9bb7 100644
--- a/compiler/dex/ssa_transformation.cc
+++ b/compiler/dex/ssa_transformation.cc
@@ -276,11 +276,11 @@
 
   if (bb->dominators == NULL) {
     bb->dominators = new (arena_) ArenaBitVector(arena_, num_total_blocks,
-                                                 false /* expandable */, kBitMapDominators);
+                                                 true /* expandable */, kBitMapDominators);
     bb->i_dominated = new (arena_) ArenaBitVector(arena_, num_total_blocks,
-                                                  false /* expandable */, kBitMapIDominated);
+                                                  true /* expandable */, kBitMapIDominated);
     bb->dom_frontier = new (arena_) ArenaBitVector(arena_, num_total_blocks,
-                                                   false /* expandable */, kBitMapDomFrontier);
+                                                   true /* expandable */, kBitMapDomFrontier);
   } else {
     bb->dominators->ClearAllBits();
     bb->i_dominated->ClearAllBits();