diff --git a/mlir/lib/Dialect/Math/Transforms/PolynomialApproximation.cpp b/mlir/lib/Dialect/Math/Transforms/PolynomialApproximation.cpp
--- a/mlir/lib/Dialect/Math/Transforms/PolynomialApproximation.cpp
+++ b/mlir/lib/Dialect/Math/Transforms/PolynomialApproximation.cpp
@@ -11,6 +11,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+#ifdef _WIN32
+#define _USE_MATH_DEFINES
+#endif
+
 #include <climits>
 #include <cmath>
 #include <cstddef>