diff --git a/file.c b/file.c
index 3b0cd67..56f2b50 100644
--- a/file.c
+++ b/file.c
@@ -4301,7 +4301,6 @@ struct utimbuf {
 
 #ifdef __CYGWIN__
 #include <winerror.h>
-extern unsigned long __attribute__((stdcall)) GetLastError(void);
 #endif
 
 static VALUE