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-rw-r--r--src/shared_mutex.cpp1
1 files changed, 0 insertions, 1 deletions
diff --git a/src/shared_mutex.cpp b/src/shared_mutex.cpp
index 874aceb1b03a..6185f15deabd 100644
--- a/src/shared_mutex.cpp
+++ b/src/shared_mutex.cpp
@@ -10,7 +10,6 @@
#include "__config"
#ifndef _LIBCPP_HAS_NO_THREADS
-#define _LIBCPP_BUILDING_SHARED_MUTEX
#include "shared_mutex"
_LIBCPP_BEGIN_NAMESPACE_STD