diff --git a/src/drivers/common/configSys.cpp b/src/drivers/common/configSys.cpp
index 79612186..eebb4734 100644
--- a/src/drivers/common/configSys.cpp
+++ b/src/drivers/common/configSys.cpp
@@ -2,6 +2,7 @@
 #include <fstream>
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "../../types.h"
 #include "configSys.h"
diff --git a/src/ines.h b/src/ines.h
index 793d488c..a285b6b5 100644
--- a/src/ines.h
+++ b/src/ines.h
@@ -21,7 +21,8 @@
 
 #ifndef _INES_H_
 #define _INES_H_
-
+#include <stdlib.h>
+#include <string.h>
 #ifdef INESPRIV
 
 void iNESStateRestore(int version);
diff --git a/src/utils/guid.cpp b/src/utils/guid.cpp
index 409ac61a..99649a71 100644
--- a/src/utils/guid.cpp
+++ b/src/utils/guid.cpp
@@ -1,5 +1,5 @@
 #include "guid.h"
-
+#include <stdlib.h>
 void FCEU_Guid::newGuid()
 {
 	for(int i=0;i<size;i++)