diff --git a/src/unix/cygwin.c b/src/unix/cygwin.c
index 9fe4093ef46..9da20e203aa 100644
--- a/src/unix/cygwin.c
+++ b/src/unix/cygwin.c
@@ -38,7 +38,7 @@ int uv_uptime(double* uptime) {
 int uv_resident_set_memory(size_t* rss) {
   /* FIXME: read /proc/meminfo? */
   *rss = 0;
-  return UV_ENOSYS;
+  return 0;
 }
 
 int uv_cpu_info(uv_cpu_info_t** cpu_infos, int* count) {