diff --git a/apps/voicemail/AmSmtpClient.cpp b/apps/voicemail/AmSmtpClient.cpp
index 7a180252..44b055af 100644
--- a/apps/voicemail/AmSmtpClient.cpp
+++ b/apps/voicemail/AmSmtpClient.cpp
@@ -32,6 +32,7 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <time.h>
+#include <string.h>
 
 #include "AmSmtpClient.h"
 #include "AmUtils.h"
diff --git a/core/AmArg.h b/core/AmArg.h
index 43dd32a0..4f9ff9ed 100644
--- a/core/AmArg.h
+++ b/core/AmArg.h
@@ -30,6 +30,7 @@
 
 #include <assert.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include <vector>
 using std::vector;
diff --git a/core/AmSipMsg.cpp b/core/AmSipMsg.cpp
index 1642e1ae..1a56281b 100644
--- a/core/AmSipMsg.cpp
+++ b/core/AmSipMsg.cpp
@@ -1,4 +1,5 @@
-
+#include <string.h>
+#include <stdlib.h>
 #include "AmSipMsg.h"
 
 
diff --git a/core/plug-in/stats/query_stats.c b/core/plug-in/stats/query_stats.c
index 3823f4e3..674f16cd 100644
--- a/core/plug-in/stats/query_stats.c
+++ b/core/plug-in/stats/query_stats.c
@@ -6,6 +6,7 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
+#include <stdlib.h>
 
 #include <map>
 #include <string>