diff --git a/examples/arpspoofing.cpp b/examples/arpspoofing.cpp
index f350b19..8677641 100644
--- a/examples/arpspoofing.cpp
+++ b/examples/arpspoofing.cpp
@@ -32,6 +32,7 @@
 #include <string>
 #include <stdexcept>
 #include <cstdlib>
+#include <unistd.h>
 #include <tins/arp.h>
 #include <tins/network_interface.h>
 #include <tins/utils.h>
diff --git a/examples/portscan.cpp b/examples/portscan.cpp
index 5081957..4ef7478 100644
--- a/examples/portscan.cpp
+++ b/examples/portscan.cpp
@@ -33,6 +33,7 @@
 #include <string>
 #include <cstdlib>
 #include <pthread.h>
+#include <unistd.h>
 #include <tins/ip.h>
 #include <tins/tcp.h>
 #include <tins/ip_address.h>