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-rw-r--r--src/mutex.cpp1
1 files changed, 0 insertions, 1 deletions
diff --git a/src/mutex.cpp b/src/mutex.cpp
index c36bd5549da8..c61d34bb885b 100644
--- a/src/mutex.cpp
+++ b/src/mutex.cpp
@@ -7,7 +7,6 @@
//
//===----------------------------------------------------------------------===//
-#define _LIBCPP_BUILDING_MUTEX
#include "mutex"
#include "limits"
#include "system_error"