diff --git a/src/controller/controller_statistics.cpp b/src/controller/controller_statistics.cpp
index c0e3072e..a536313f 100644
--- a/src/controller/controller_statistics.cpp
+++ b/src/controller/controller_statistics.cpp
@@ -46,7 +46,7 @@ unsigned int Controller::maxConnsPerIP = 0;
 /// Session cache shared memory page
 IPC::sharedPage shmSessions(SHM_SESSIONS, SHM_SESSIONS_SIZE, true);
 /// Lock for the session cache shared memory page
-IPC::semaphore cacheLock(SEM_SESSCACHE, O_CREAT | O_RDWR, ACCESSPERMS, 1);
+IPC::semaphore Controller::cacheLock(SEM_SESSCACHE, O_CREAT | O_RDWR, ACCESSPERMS, 1);
 
 //For server-wide totals. Local to this file only.
 struct streamTotals {
diff --git a/src/controller/controller_statistics.h b/src/controller/controller_statistics.h
index f134019e..2dbc6b44 100644
--- a/src/controller/controller_statistics.h
+++ b/src/controller/controller_statistics.h
@@ -17,6 +17,7 @@ namespace Controller {
   
   extern bool killOnExit;
   extern unsigned int maxConnsPerIP;
+  extern Controller::semaphore cacheLock;
 
   //These keep track of which streams are currently active.
   extern std::map<std::string, unsigned int> activeStreams;