diff --git a/src/util/util_matrix.h b/src/util/util_matrix.h
index 4e386628..98f260f8 100644
--- a/src/util/util_matrix.h
+++ b/src/util/util_matrix.h
@@ -68,6 +68,8 @@ namespace dxvk {
 
   };
 
+  static_assert(sizeof(Matrix4) == sizeof(Vector4) * 4);
+
   inline Matrix4 operator*(float scalar, const Matrix4& m) { return m * scalar; }
 
   Matrix4 transpose(const Matrix4& m);
diff --git a/src/util/util_vector.h b/src/util/util_vector.h
index 5111a9eb..e7ab5f90 100644
--- a/src/util/util_vector.h
+++ b/src/util/util_vector.h
@@ -146,6 +146,9 @@ namespace dxvk {
   using Vector4  = Vector4Base<float>;
   using Vector4i = Vector4Base<int>;
 
+  static_assert(sizeof(Vector4)  == sizeof(float) * 4);
+  static_assert(sizeof(Vector4i) == sizeof(int)   * 4);
+
   inline Vector4 replaceNaN(Vector4 a) {
     Vector4 result;
     __m128 value = _mm_load_ps(a.data);