1 files changed, 4 insertions, 0 deletions
diff --git a/error.c b/error.c
index 393603ff7a..1e53b9a653 100644
--- a/error.c
+++ b/error.c
@@ -26,6 +26,10 @@
 int sys_nerr = 256;
 #endif
 
+#if defined __CYGWIN__ && defined _sys_nerr
+#define sys_nerr _sys_nerr
+#endif
+
 int ruby_nerrs;
 
 static void