diff --git a/third_party/eigen3/unsupported/Eigen/CXX11/Tensor b/third_party/eigen3/unsupported/Eigen/CXX11/Tensor
index 00d2e7c0c78..861a87b68bf 100644
--- a/third_party/eigen3/unsupported/Eigen/CXX11/Tensor
+++ b/third_party/eigen3/unsupported/Eigen/CXX11/Tensor
@@ -1,9 +1,11 @@
-#ifdef _WIN32
-#define sleep(seconds) Sleep(1000*seconds)
-#endif  // _WIN32
 #include "unsupported/Eigen/CXX11/Tensor"
 
 #ifdef _WIN32
+#ifndef SLEEP_FUNC_HEADER_GUARD
+#define SLEEP_FUNC_HEADER_GUARD
+inline void sleep(unsigned int seconds) { Sleep(1000*seconds); }
+#endif
+
 // On Windows, Eigen will include Windows.h, which defines various
 // macros that conflict with TensorFlow symbols. Undefine them here to
 // prevent clashes.