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-rw-r--r--absl/time/internal/cctz/include/cctz/civil_time_detail.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/absl/time/internal/cctz/include/cctz/civil_time_detail.h b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
index a5923f13c70b..bb191b3faee5 100644
--- a/absl/time/internal/cctz/include/cctz/civil_time_detail.h
+++ b/absl/time/internal/cctz/include/cctz/civil_time_detail.h
@@ -21,7 +21,7 @@
 #include <type_traits>
 
 // Disable constexpr support unless we are in C++14 mode.
-#if __cpp_constexpr >= 201304 || _MSC_VER >= 1910
+#if __cpp_constexpr >= 201304 || (defined(_MSC_VER) && _MSC_VER >= 1910)
 #define CONSTEXPR_D constexpr  // data
 #define CONSTEXPR_F constexpr  // function
 #define CONSTEXPR_M constexpr  // member