diff --git a/include/stdex/math.hpp b/include/stdex/math.hpp
index b62ad2886..3169fe5e7 100644
--- a/include/stdex/math.hpp
+++ b/include/stdex/math.hpp
@@ -89,7 +89,7 @@ namespace stdex
 	///
 	/// \return The first number greater or equal to a that has n lower bits zero
 	///
-	inline constexpr size_t align_up(size_t a, int n)
+	inline size_t align_up(size_t a, int n)
 	{
 		const size_t mask = SIZE_MAX << n;
 		return add(a, ~mask) & mask;