diff --git a/auto/threads b/auto/threads
index 0c677f1..0c5fd56 100644
--- a/auto/threads
+++ b/auto/threads
@@ -2,7 +2,7 @@
 if [ $USE_THREADS = "rfork" ]; then
 
     have=NGX_THREADS . auto/have
-    have=USE_RFORK . auto/have
+    have=NGX_USE_RFORK . auto/have
     CORE_DEPS="$CORE_DEPS $UNIX_THREADS_DEPS"
     CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_SRCS"