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-rw-r--r--unsupported/Eigen/CXX11/Tensor1
1 files changed, 1 insertions, 0 deletions
diff --git a/unsupported/Eigen/CXX11/Tensor b/unsupported/Eigen/CXX11/Tensor
index 969f25481..16132398d 100644
--- a/unsupported/Eigen/CXX11/Tensor
+++ b/unsupported/Eigen/CXX11/Tensor
@@ -51,6 +51,7 @@ typedef unsigned __int64 uint64_t;
#endif
#ifdef EIGEN_USE_THREADS
+#include <atomic>
#include <condition_variable>
#include <deque>
#include <mutex>