diff --git a/src/core/ngx_spinlock.c b/src/core/ngx_spinlock.c
index 33477e2ee..9c93afaf1 100644
--- a/src/core/ngx_spinlock.c
+++ b/src/core/ngx_spinlock.c
@@ -42,7 +42,7 @@ ngx_spinlock(ngx_atomic_t *lock, ngx_atomic_int_t value, ngx_uint_t spin)
 
 #else
 
-#if (NGX_OLD_THREADS)
+#if (NGX_THREADS)
 
 #error ngx_spinlock() or ngx_atomic_cmp_set() are not defined !