diff --git a/src/unix/cygwin.c b/src/unix/cygwin.c
index 9da20e20..6b5cfb7b 100644
--- a/src/unix/cygwin.c
+++ b/src/unix/cygwin.c
@@ -52,3 +52,7 @@ void uv_free_cpu_info(uv_cpu_info_t* cpu_infos, int count) {
   (void)cpu_infos;
   (void)count;
 }
+
+uint64_t uv_get_constrained_memory(void) {
+  return 0;  /* Memory constraints are unknown. */
+}