diff --git a/samples/sockets/Sockets.cpp b/samples/sockets/Sockets.cpp
index 07602190..978af35a 100644
--- a/samples/sockets/Sockets.cpp
+++ b/samples/sockets/Sockets.cpp
@@ -2,7 +2,8 @@
 ////////////////////////////////////////////////////////////
 // Headers
 ////////////////////////////////////////////////////////////
-#include <iostream>
+#include <iostream>
+#include <cstdlib>
 
 
 ////////////////////////////////////////////////////////////
diff --git a/samples/voip/VoIP.cpp b/samples/voip/VoIP.cpp
index 09360b67..125bd8a5 100644
--- a/samples/voip/VoIP.cpp
+++ b/samples/voip/VoIP.cpp
@@ -3,7 +3,8 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <iomanip>
-#include <iostream>
+#include <iostream>
+#include <cstdlib>
 
 
 ////////////////////////////////////////////////////////////