diff --git a/src/win/error.c b/src/win/error.c
index 88d30d9fa..3162bc787 100644
--- a/src/win/error.c
+++ b/src/win/error.c
@@ -24,6 +24,7 @@
 #include <malloc.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "uv.h"
 #include "internal.h"
diff --git a/src/win/handle.c b/src/win/handle.c
index c0119bcf6..268482004 100644
--- a/src/win/handle.c
+++ b/src/win/handle.c
@@ -21,6 +21,7 @@
 
 #include <assert.h>
 #include <io.h>
+#include <stdlib.h>
 
 #include "uv.h"
 #include "internal.h"
diff --git a/src/win/thread.c b/src/win/thread.c
index 0631da5af..5178f8f9a 100644
--- a/src/win/thread.c
+++ b/src/win/thread.c
@@ -21,6 +21,7 @@
 
 #include <assert.h>
 #include <limits.h>
+#include <stdlib.h>
 
 #include "uv.h"
 #include "internal.h"
diff --git a/src/win/tty.c b/src/win/tty.c
index 4f9cfa56a..8855af350 100644
--- a/src/win/tty.c
+++ b/src/win/tty.c
@@ -22,6 +22,7 @@
 #include <assert.h>
 #include <io.h>
 #include <string.h>
+#include <stdlib.h>
 
 #if defined(_MSC_VER) && _MSC_VER < 1600
 # include "stdint-msvc2008.h"
diff --git a/src/win/udp.c b/src/win/udp.c
index 0f100bf09..31812e464 100644
--- a/src/win/udp.c
+++ b/src/win/udp.c
@@ -20,6 +20,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 
 #include "uv.h"
 #include "internal.h"