diff --git a/src/numa.h b/src/numa.h
index 967e24a6..5934a0cd 100644
--- a/src/numa.h
+++ b/src/numa.h
@@ -773,8 +773,8 @@ class NumaConfig {
                 return std::nullopt;
 
             // We are expecting a single group.
-            USHORT GroupCount = 1;
-            USHORT GroupArray[1];
+            USHORT            GroupCount = 1;
+            alignas(4) USHORT GroupArray[1];
             status = GetProcessGroupAffinity_f(GetCurrentProcess(), &GroupCount, GroupArray);
             if (status == 0 || GroupCount != 1)
                 return std::nullopt;