diff --git a/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp b/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp
index 9a5d402e30..2053338dcb 100644
--- a/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp
+++ b/src/add-ons/kernel/network/datalink_protocols/arp/arp.cpp
@@ -120,7 +120,6 @@ static void arp_timer(struct net_timer *timer, void *data);
 net_buffer_module_info* gBufferModule;
 static net_stack_module_info* sStackModule;
 static net_datalink_module_info* sDatalinkModule;
-static mutex sCacheLock;
 static bool sIgnoreReplies;
 
 
@@ -152,6 +151,7 @@ struct arpHash {
 
 typedef BOpenHashTable<arpHash> AddressCache;
 static AddressCache* sCache;
+static mutex sCacheLock;
 
 
 #ifdef TRACE_ARP