diff --git a/src/plugin_codecfilter.c b/src/plugin_codecfilter.c
index 72fed27..ce72592 100644
--- a/src/plugin_codecfilter.c
+++ b/src/plugin_codecfilter.c
@@ -23,6 +23,7 @@
 
 #include "config.h"
 
+#include <stdlib.h>
 #include <string.h>
 
 #include <sys/types.h>
diff --git a/src/plugin_fix_bogus_via.c b/src/plugin_fix_bogus_via.c
index 1ff063d..00d9c14 100644
--- a/src/plugin_fix_bogus_via.c
+++ b/src/plugin_fix_bogus_via.c
@@ -23,6 +23,7 @@
 
 #include "config.h"
 
+#include <stdlib.h>
 #include <string.h>
 
 #include <sys/types.h>
diff --git a/src/plugin_fix_fbox_anoncall.c b/src/plugin_fix_fbox_anoncall.c
index 3e71a0e..7fa3ab1 100644
--- a/src/plugin_fix_fbox_anoncall.c
+++ b/src/plugin_fix_fbox_anoncall.c
@@ -23,6 +23,7 @@
 
 #include "config.h"
 
+#include <stdlib.h>
 #include <string.h>
 
 #include <sys/types.h>
diff --git a/src/plugin_siptrunk.c b/src/plugin_siptrunk.c
index 4c94859..5c717d0 100644
--- a/src/plugin_siptrunk.c
+++ b/src/plugin_siptrunk.c
@@ -23,6 +23,7 @@
 
 #include "config.h"
 
+#include <stdlib.h>
 #include <string.h>
 #include <regex.h>
 
diff --git a/src/plugin_stripheader.c b/src/plugin_stripheader.c
index 98c48e6..c69c17e 100644
--- a/src/plugin_stripheader.c
+++ b/src/plugin_stripheader.c
@@ -23,6 +23,7 @@
 
 #include "config.h"
 
+#include <stdlib.h>
 #include <string.h>
 
 #include <sys/types.h>
diff --git a/src/plugin_stun.c b/src/plugin_stun.c
index 5c332b3..3a08a26 100644
--- a/src/plugin_stun.c
+++ b/src/plugin_stun.c
@@ -23,6 +23,7 @@
 
 #include "config.h"
 
+#include <stdlib.h>
 #include <string.h>
 
 #include <sys/types.h>
diff --git a/src/plugins.c b/src/plugins.c
index 1905469..1dea90e 100644
--- a/src/plugins.c
+++ b/src/plugins.c
@@ -22,6 +22,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <stdlib.h>
 
 #include <sys/types.h>
 #include <netinet/in.h>
diff --git a/src/rtpproxy_relay.c b/src/rtpproxy_relay.c
index c0013f7..0fb1967 100644
--- a/src/rtpproxy_relay.c
+++ b/src/rtpproxy_relay.c
@@ -118,7 +118,7 @@ int rtp_relay_init( void ) {
    pthread_attr_init(&attr);
    pthread_attr_init(&attr);
    pthread_attr_getstacksize (&attr, &stacksize);
-   INFO("Current thread stacksize is %i kB",stacksize/1024);   
+   INFO("Current thread stacksize is %lu kB",(stacksize/1024));
 
    /* experimental feature:
     * reduce the thread stack size to reduce the overall