stan_math_eigen.patch

diff --git a/stan/math/rev/fun/Eigen_NumTraits.hpp b/stan/math/rev/fun/Eigen_NumTraits.hpp
index 79fbead7c8..6f8f957f15 100644
--- a/stan/math/rev/fun/Eigen_NumTraits.hpp
+++ b/stan/math/rev/fun/Eigen_NumTraits.hpp
@@ -194,10 +194,10 @@ struct general_matrix_vector_product<Index, stan::math::var, LhsMapper,
 };
 
 template <typename Index, int LhsStorageOrder, bool ConjugateLhs,
-          int RhsStorageOrder, bool ConjugateRhs>
+          int RhsStorageOrder, bool ConjugateRhs, int ResInnerStride>
 struct general_matrix_matrix_product<Index, stan::math::var, LhsStorageOrder,
                                      ConjugateLhs, stan::math::var,
-                                     RhsStorageOrder, ConjugateRhs, ColMajor> {
+                                     RhsStorageOrder, ConjugateRhs, ColMajor, ResInnerStride> {
   using LhsScalar = stan::math::var;
   using RhsScalar = stan::math::var;
   using ResScalar = stan::math::var;