diff --git a/Numeric/RegisterSizes.hpp b/Numeric/RegisterSizes.hpp
index c0a86b92f..669227e9c 100644
--- a/Numeric/RegisterSizes.hpp
+++ b/Numeric/RegisterSizes.hpp
@@ -19,7 +19,7 @@
 namespace CPU {
 
 /// Provides access to all intermediate parts of a larger int.
-template <typename Full, typename Half> union alignas(Full) RegisterPair {
+template <typename Full, typename Half> union alignas(Full) alignas(Half) RegisterPair {
 	RegisterPair(Full v) : full(v) {}
 	RegisterPair() {}