diff --git a/components/openmw-mp/Packets/PacketPreInit.cpp b/components/openmw-mp/Packets/PacketPreInit.cpp
index fb6e59ca2..3b8ae4f0b 100644
--- a/components/openmw-mp/Packets/PacketPreInit.cpp
+++ b/components/openmw-mp/Packets/PacketPreInit.cpp
@@ -11,15 +11,15 @@ mwmp::PacketPreInit::PacketPreInit(RakNet::RakPeerInterface *peer) : BasePacket(
     packetID = ID_GAME_PREINIT;
 }
 
-void mwmp::PacketPreInit::Packet(RakNet::BitStream *bs, bool send, PluginContainer &checksums)
+void mwmp::PacketPreInit::Packet(RakNet::BitStream *bs, bool send)
 {
     BasePacket::Packet(bs, send);
 
-    unsigned int size = checksums.size();
+    unsigned int size = checksums->size();
     RW(size, send);
     if(send)
     {
-        BOOST_FOREACH(PluginContainer::value_type & checksum, checksums)
+        BOOST_FOREACH(PluginContainer::value_type & checksum, *checksums)
         {
             RW(checksum.first, true);
             RW(checksum.second, true);
@@ -32,7 +32,12 @@ void mwmp::PacketPreInit::Packet(RakNet::BitStream *bs, bool send, PluginContain
             PluginPair checksum;
             RW(checksum.first, false);
             RW(checksum.second, false);
-            checksums.push_back(checksum);
+            checksums->push_back(checksum);
         }
     }
 }
+
+void mwmp::PacketPreInit::setChecksums(mwmp::PacketPreInit::PluginContainer *checksums)
+{
+    this->checksums = checksums;
+}
diff --git a/components/openmw-mp/Packets/PacketPreInit.hpp b/components/openmw-mp/Packets/PacketPreInit.hpp
index 61b359df5..977140bc0 100644
--- a/components/openmw-mp/Packets/PacketPreInit.hpp
+++ b/components/openmw-mp/Packets/PacketPreInit.hpp
@@ -19,7 +19,10 @@ namespace mwmp
 
         PacketPreInit(RakNet::RakPeerInterface *peer);
 
-        virtual void Packet(RakNet::BitStream *bs, bool send, PluginContainer &checksums);
+        virtual void Packet(RakNet::BitStream *bs, bool send);
+        void setChecksums(PluginContainer *checksums);
+    private:
+        PluginContainer *checksums;
     };
 }