diff --git a/src/unix/cygwin.c b/src/unix/cygwin.c
index a3d173650..aef8d7672 100644
--- a/src/unix/cygwin.c
+++ b/src/unix/cygwin.c
@@ -19,6 +19,7 @@
  */
 
 #include "uv.h"
+#include "../uv-common.h"
 
 #include <assert.h>
 #include <stdint.h>