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-rw-r--r--thread_sync.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/thread_sync.c b/thread_sync.c
index 8506bff38f..f1537b6a90 100644
--- a/thread_sync.c
+++ b/thread_sync.c
@@ -1379,6 +1379,7 @@ define_thread_class(VALUE outer, const char *name, VALUE super)
static void
Init_thread_sync(void)
{
+#undef rb_intern
#if 0
rb_cMutex = rb_define_class("Mutex", rb_cObject); /* teach rdoc Mutex */
rb_cConditionVariable = rb_define_class("ConditionVariable", rb_cObject); /* teach rdoc ConditionVariable */