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-rw-r--r--thread_win32.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/thread_win32.c b/thread_win32.c
index 3770200d30..336cce1936 100644
--- a/thread_win32.c
+++ b/thread_win32.c
@@ -21,6 +21,7 @@
#define native_thread_yield() Sleep(0)
#define unregister_ubf_list(th)
#define ubf_wakeup_all_threads() do {} while (0)
+#define ubf_threads_empty() (1)
static volatile DWORD ruby_native_thread_key = TLS_OUT_OF_INDEXES;