diff --git a/server/imserver/asynctaskmgr.cc b/server/imserver/asynctaskmgr.cc
index a6bd89d..b86736f 100644
--- a/server/imserver/asynctaskmgr.cc
+++ b/server/imserver/asynctaskmgr.cc
@@ -1,5 +1,7 @@
 #include "precompile.h"
 
+#include<random>
+
 #include <a8/timer.h>
 #include <a8/openssl.h>
 
diff --git a/server/imserver/guild.cc b/server/imserver/guild.cc
index 852bced..a5ff639 100644
--- a/server/imserver/guild.cc
+++ b/server/imserver/guild.cc
@@ -1,5 +1,7 @@
 #include "precompile.h"
 
+#include <math.h>
+
 #include <a8/timer.h>
 #include <a8/openssl.h>
 #include <a8/mutable_xobject.h>
diff --git a/server/imserver/playermgr.cc b/server/imserver/playermgr.cc
index 98fc3c9..941c5ad 100644
--- a/server/imserver/playermgr.cc
+++ b/server/imserver/playermgr.cc
@@ -1,5 +1,7 @@
 #include "precompile.h"
 
+#include<random>
+
 #include <a8/openssl.h>
 #include <a8/udplog.h>
 
diff --git a/server/imserver/utils.cc b/server/imserver/utils.cc
index 280bdd7..311310d 100644
--- a/server/imserver/utils.cc
+++ b/server/imserver/utils.cc
@@ -1,4 +1,7 @@
 #include "precompile.h"
+
+#include <cmath>
+
 #include "utils.h"
 
 #include "cs_proto.pb.h"