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-rw-r--r--src/mongo/db/background.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/mongo/db/background.cpp b/src/mongo/db/background.cpp
index 306d966a01b..e3869b1bd6b 100644
--- a/src/mongo/db/background.cpp
+++ b/src/mongo/db/background.cpp
@@ -37,6 +37,7 @@
#include "mongo/base/disallow_copying.h"
#include "mongo/stdx/condition_variable.h"
+#include "mongo/stdx/mutex.h"
#include "mongo/stdx/thread.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/map_util.h"