diff --git a/src/stan/model/indexing/rvalue.hpp b/src/stan/model/indexing/rvalue.hpp
index a243b04ba2a..2c1854c1796 100644
--- a/src/stan/model/indexing/rvalue.hpp
+++ b/src/stan/model/indexing/rvalue.hpp
@@ -280,7 +280,7 @@ inline auto rvalue(EigMat&& x, const char* name, MultiIndex&& idx) {
       [](auto&& x_ref, auto&& idx_inner) {
         using vec_map = Eigen::Map<const Eigen::Array<int, -1, 1>>;
         return x_ref((vec_map(idx_inner.ns_.data(), idx_inner.ns_.size()) - 1),
-                     Eigen::all);
+                     Eigen::indexing::all);
       },
       stan::math::to_ref(std::forward<EigMat>(x)),
       std::forward<MultiIndex>(idx));
@@ -591,7 +591,7 @@ inline auto rvalue(EigMat&& x, const char* name, Idx&& row_idx,
       [name](auto&& x_ref, auto&& row_idx_inner, auto&& col_idx_inner) {
         using vec_map = Eigen::Map<const Eigen::Array<int, -1, 1>>;
         return rvalue(
-            x_ref(Eigen::all,
+            x_ref(Eigen::indexing::all,
                   (vec_map(col_idx_inner.ns_.data(), col_idx_inner.ns_.size())
                    - 1)),
             name, std::forward<decltype(row_idx_inner)>(row_idx_inner));
diff --git a/src/test/unit/services/pathfinder/eight_schools_test.cpp b/src/test/unit/services/pathfinder/eight_schools_test.cpp
index 755525db194..cd901623040 100644
--- a/src/test/unit/services/pathfinder/eight_schools_test.cpp
+++ b/src/test/unit/services/pathfinder/eight_schools_test.cpp
@@ -124,7 +124,7 @@ TEST_F(ServicesPathfinderEightSchools, multi) {
     EXPECT_GE(param_vals.col(2)(i), 0);
     EXPECT_LE(param_vals.col(2)(i), num_paths);
   }
-  auto param_tmp = param_vals(Eigen::all, param_indices);
+  auto param_tmp = param_vals(Eigen::indexing::all, param_indices);
   auto mean_sd_pair = stan::test::get_mean_sd(param_tmp);
   auto&& mean_vals = mean_sd_pair.first;
   auto&& sd_vals = mean_sd_pair.second;
@@ -448,7 +448,7 @@ TEST_F(ServicesPathfinderEightSchools, single) {
   for (auto&& x_i : param_vals.col(2)) {
     EXPECT_EQ(x_i, stride_id);
   }
-  auto param_tmp = param_vals(Eigen::all, param_indices);
+  auto param_tmp = param_vals(Eigen::indexing::all, param_indices);
   auto mean_sd_pair = stan::test::get_mean_sd(param_tmp);
   auto&& mean_vals = mean_sd_pair.first;
   auto&& sd_vals = mean_sd_pair.second;
diff --git a/src/test/unit/services/pathfinder/normal_glm_test.cpp b/src/test/unit/services/pathfinder/normal_glm_test.cpp
index 72d7926e52a..913ab591cd7 100644
--- a/src/test/unit/services/pathfinder/normal_glm_test.cpp
+++ b/src/test/unit/services/pathfinder/normal_glm_test.cpp
@@ -101,7 +101,7 @@ TEST_F(ServicesPathfinderGLM, single) {
     EXPECT_EQ(x_i, stride_id);
   }
 
-  auto param_tmp = param_vals(Eigen::all, param_indices);
+  auto param_tmp = param_vals(Eigen::indexing::all, param_indices);
   auto mean_sd_pair = stan::test::get_mean_sd(param_tmp);
   auto&& mean_vals = mean_sd_pair.first;
   auto&& sd_vals = mean_sd_pair.second;
@@ -240,7 +240,7 @@ TEST_F(ServicesPathfinderGLM, multi_null_unique) {
     EXPECT_GE(param_vals.col(2)(i), 0);
     EXPECT_LE(param_vals.col(2)(i), num_paths);
   }
-  auto param_tmp = param_vals(Eigen::all, param_indices);
+  auto param_tmp = param_vals(Eigen::indexing::all, param_indices);
   auto mean_sd_pair = stan::test::get_mean_sd(param_tmp);
   auto&& mean_vals = mean_sd_pair.first;
   auto&& sd_vals = mean_sd_pair.second;
@@ -318,7 +318,7 @@ TEST_F(ServicesPathfinderGLM, multi) {
     EXPECT_GE(param_vals.col(2)(i), 0);
     EXPECT_LE(param_vals.col(2)(i), num_paths);
   }
-  auto param_tmp = param_vals(Eigen::all, param_indices);
+  auto param_tmp = param_vals(Eigen::indexing::all, param_indices);
   auto mean_sd_pair = stan::test::get_mean_sd(param_tmp);
   auto&& mean_vals = mean_sd_pair.first;
   auto&& sd_vals = mean_sd_pair.second;