diff --git a/src/PRDevice.cpp b/src/PRDevice.cpp
index 1339ee1..dac605a 100644
--- a/src/PRDevice.cpp
+++ b/src/PRDevice.cpp
@@ -29,6 +29,9 @@
  */
 
 #include "PRDevice.h"
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 
 PRDevice::PRDevice(PRMachineType machineType) : machineType(machineType)
 {
diff --git a/src/pinproc.cpp b/src/pinproc.cpp
index 06fec47..f404567 100644
--- a/src/pinproc.cpp
+++ b/src/pinproc.cpp
@@ -31,6 +31,9 @@
 #include "../include/pinproc.h"
 #include "PRDevice.h"
 #include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
 #define MAX_TEXT (1024)