diff --git a/examples/nbody/nbody.cpp b/examples/nbody/nbody.cpp
index 455aeb5c7c..9f09632496 100644
--- a/examples/nbody/nbody.cpp
+++ b/examples/nbody/nbody.cpp
@@ -1018,7 +1018,7 @@ namespace manualAoSoAManualAVX
 namespace manualAoSoASIMD
 {
     template<typename Simd>
-    struct alignas(64) ParticleBlock
+    struct alignas(sizeof(Simd)) ParticleBlock
     {
         struct
         {
@@ -1029,7 +1029,6 @@ namespace manualAoSoASIMD
         Simd mass;
     };
 
-
     template<typename Simd, typename SimdOrScalar>
     inline void pPInteraction(
         Simd piposx,