private void ensureMorphedUnitsIsMutable() {
        if (!((bitField0_ & 0x00000400) == 0x00000400)) {
          morphedUnits_ = new java.util.ArrayList<org.bwapi.proxy.messages.GameMessages.UnitId>(morphedUnits_);
          bitField0_ |= 0x00000400;
         }
      }