diff --git a/tl/expected.hpp b/tl/expected.hpp
index 5634856..7af0855 100644
--- a/tl/expected.hpp
+++ b/tl/expected.hpp
@@ -78,7 +78,7 @@
 #define TL_EXPECTED_GCC49_CONSTEXPR constexpr
 #endif
 
-#ifdef TL_EXPECTED_MSVC2015_CONSTEXPR
+#ifdef TL_EXPECTED_MSVC2015
 #define TL_EXPECTED_MSVC2015_CONSTEXPR
 #else
 #define TL_EXPECTED_MSVC2015_CONSTEXPR constexpr