diff --git a/src/runtime/cgo/gcc_libinit_windows.c b/src/runtime/cgo/gcc_libinit_windows.c
index b6f51b3e4d..248d59fd69 100644
--- a/src/runtime/cgo/gcc_libinit_windows.c
+++ b/src/runtime/cgo/gcc_libinit_windows.c
@@ -9,6 +9,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <errno.h>
 
 #include "libcgo.h"
 
diff --git a/src/runtime/cgo/gcc_windows_386.c b/src/runtime/cgo/gcc_windows_386.c
index f2ff710f60..9184b91393 100644
--- a/src/runtime/cgo/gcc_windows_386.c
+++ b/src/runtime/cgo/gcc_windows_386.c
@@ -7,6 +7,7 @@
 #include <process.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <errno.h>
 #include "libcgo.h"
 
 static void threadentry(void*);
diff --git a/src/runtime/cgo/gcc_windows_amd64.c b/src/runtime/cgo/gcc_windows_amd64.c
index 511ab44fa9..7192a24631 100644
--- a/src/runtime/cgo/gcc_windows_amd64.c
+++ b/src/runtime/cgo/gcc_windows_amd64.c
@@ -7,6 +7,7 @@
 #include <process.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <errno.h>
 #include "libcgo.h"
 
 static void threadentry(void*);