diff --git a/ortools/linear_solver/proto_solver/gurobi_proto_solver.cc b/ortools/linear_solver/proto_solver/gurobi_proto_solver.cc
index 2b9ecbec87..066d68c9af 100644
--- a/ortools/linear_solver/proto_solver/gurobi_proto_solver.cc
+++ b/ortools/linear_solver/proto_solver/gurobi_proto_solver.cc
@@ -27,6 +27,7 @@
 #include "absl/strings/str_format.h"
 #include "absl/strings/str_join.h"
 #include "absl/strings/str_split.h"
+#include "absl/strings/string_view.h"
 #include "absl/types/optional.h"
 #include "ortools/base/cleanup.h"
 #include "ortools/base/status_macros.h"
@@ -222,7 +223,7 @@ int AddMaxConstraint(const MPGeneralConstraintProto& gen_cst,
 }
 }  // namespace
 
-absl::Status SetSolverSpecificParameters(const std::string& parameters,
+absl::Status SetSolverSpecificParameters(absl::string_view parameters,
                                          GRBenv* gurobi) {
   if (parameters.empty()) return absl::OkStatus();
   std::vector<std::string> error_messages;
diff --git a/ortools/linear_solver/proto_solver/gurobi_proto_solver.h b/ortools/linear_solver/proto_solver/gurobi_proto_solver.h
index 918ac4df10..10d6199ce9 100644
--- a/ortools/linear_solver/proto_solver/gurobi_proto_solver.h
+++ b/ortools/linear_solver/proto_solver/gurobi_proto_solver.h
@@ -18,6 +18,7 @@
 
 #include "absl/status/status.h"
 #include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
 #include "ortools/gurobi/environment.h"
 #include "ortools/linear_solver/linear_solver.pb.h"
 
@@ -46,7 +47,7 @@ absl::StatusOr<MPSolutionResponse> GurobiSolveProto(
 // "#\n# Gurobi-specific parameters, still part of the
 // comment\n\nThreads=1\nPresolve  2,SolutionLimit=100" This function will
 // process each and every token, even if an intermediate token is unrecognized.
-absl::Status SetSolverSpecificParameters(const std::string& parameters,
+absl::Status SetSolverSpecificParameters(absl::string_view parameters,
                                          GRBenv* gurobi);
 }  // namespace operations_research
 #endif  // OR_TOOLS_LINEAR_SOLVER_PROTO_SOLVER_GUROBI_PROTO_SOLVER_H_
diff --git a/ortools/linear_solver/proto_solver/scip_proto_solver.cc b/ortools/linear_solver/proto_solver/scip_proto_solver.cc
index 3d046a5d19..ea8fc8aa6c 100644
--- a/ortools/linear_solver/proto_solver/scip_proto_solver.cc
+++ b/ortools/linear_solver/proto_solver/scip_proto_solver.cc
@@ -31,6 +31,7 @@
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
 #include "absl/strings/str_split.h"
+#include "absl/strings/string_view.h"
 #include "absl/time/time.h"
 #include "ortools/base/cleanup.h"
 #include "ortools/base/commandlineflags.h"
@@ -277,8 +278,7 @@ absl::Status AddAbsConstraint(const MPGeneralConstraintProto& gen_cst,
   std::vector<SCIP_VAR*> vars;
   std::vector<double> vals;
   std::vector<SCIP_CONS*> cons;
-  auto add_abs_constraint =
-      [&](const std::string& name_prefix) -> absl::Status {
+  auto add_abs_constraint = [&](absl::string_view name_prefix) -> absl::Status {
     SCIP_CONS* scip_cons = nullptr;
     CHECK(vars.size() == vals.size());
     const std::string name =
@@ -384,7 +384,7 @@ absl::Status AddMinMaxConstraint(const MPGeneralConstraintProto& gen_cst,
   std::vector<SCIP_VAR*> vars;
   std::vector<double> vals;
   std::vector<SCIP_CONS*> cons;
-  auto add_lin_constraint = [&](const std::string& name_prefix,
+  auto add_lin_constraint = [&](absl::string_view name_prefix,
                                 double lower_bound = 0.0,
                                 double upper_bound = 0.0) -> absl::Status {
     SCIP_CONS* scip_cons = nullptr;