diff --git a/Objects/mimalloc/prim/unix/prim.c b/Objects/mimalloc/prim/unix/prim.c
index 1598ebabf0a4da..34382eee54e599 100644
--- a/Objects/mimalloc/prim/unix/prim.c
+++ b/Objects/mimalloc/prim/unix/prim.c
@@ -77,7 +77,7 @@ static int mi_prim_access(const char *fpath, int mode) {
   return syscall(SYS_access,fpath,mode);
 }
 
-#elif !defined(__APPLE__) && !defined(_AIX) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__sun) && !defined(__NetBSD__) // avoid unused warnings
+#elif !defined(__APPLE__) && !defined(_AIX) && !defined(__CYGWIN__) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__sun) && !defined(__NetBSD__) // avoid unused warnings
 
 static int mi_prim_open(const char* fpath, int open_flags) {
   return open(fpath,open_flags);