diff --git a/src/BARON.jl b/src/BARON.jl
index 70669e7..b10e201 100644
--- a/src/BARON.jl
+++ b/src/BARON.jl
@@ -64,7 +64,7 @@ mutable struct SolutionStatus
 end
 
 mutable struct BaronModel
-    options::Dict{Symbol, Any}
+    options::Dict{String, Any}
 
     variable_info::Vector{VariableInfo}
     constraint_info::Vector{ConstraintInfo}
@@ -80,7 +80,7 @@ mutable struct BaronModel
     solution_info::Union{Nothing, SolutionStatus}
 
     function BaronModel(; kwargs...)
-        options = Dict{Symbol, Any}(key => val for (key,val) in kwargs)
+        options = Dict{String, Any}(string(key) => val for (key,val) in kwargs)
         model = new()
         model.options = options
         model.variable_info = VariableInfo[]
@@ -89,10 +89,10 @@ mutable struct BaronModel
         model.objective_expr = nothing
         temp_dir = mktempdir()
         model.temp_dir_name = temp_dir
-        model.problem_file_name = get!(options, :ProName, joinpath(temp_dir, "baron_problem.bar"))
-        model.times_file_name = get!(options, :TimName, joinpath(temp_dir, "tim.lst"))
-        model.summary_file_name = get!(options, :SumName, joinpath(temp_dir, "sum.lst"))
-        model.result_file_name = get!(options, :ResName, joinpath(temp_dir, "res.lst"))
+        model.problem_file_name = get!(options, "ProName", joinpath(temp_dir, "baron_problem.bar"))
+        model.times_file_name = get!(options, "TimName", joinpath(temp_dir, "tim.lst"))
+        model.summary_file_name = get!(options, "SumName", joinpath(temp_dir, "sum.lst"))
+        model.result_file_name = get!(options, "ResName", joinpath(temp_dir, "res.lst"))
         model.solution_info = nothing
         return model
     end
diff --git a/src/MOI_wrapper.jl b/src/MOI_wrapper.jl
index b781524..f1cec18 100644
--- a/src/MOI_wrapper.jl
+++ b/src/MOI_wrapper.jl
@@ -36,8 +36,9 @@ function MOI.is_empty(model::Optimizer)
 end
 
 function MOI.empty!(model::Optimizer)
-    model.inner = BaronModel(; model.inner.options...)
+    model.inner = BaronModel(; ((Symbol(key), val) for (key, val) in model.inner.options)...)
     model.nlp_block_data = nothing
+    return
 end
 
 # copy
@@ -57,16 +58,28 @@ function MOI.optimize!(model::Optimizer)
     read_results(model.inner)
 end
 
+# RawParameter
+MOI.supports(::Optimizer, ::MOI.RawParameter) = true
+function MOI.set(model::Optimizer, param::MOI.RawParameter, value)
+    model.inner.options[param.name] = value
+    return
+end
+function MOI.get(model::Optimizer, param::MOI.RawParameter)
+    return get(model.inner.options, param.name) do
+        throw(ErrorException("Requested parameter $(param.name) is not set."))
+    end
+end
+
 # TimeLimitSec
 MOI.supports(::Optimizer, ::MOI.TimeLimitSec) = true
 function MOI.set(model::Optimizer, ::MOI.TimeLimitSec, val::Real)
-    model.inner.options[:MaxTime] = Float64(val)
+    model.inner.options["MaxTime"] = Float64(val)
     return
 end
 
 # BARON's default time limit is 1000 seconds.
 function MOI.get(model::Optimizer, ::MOI.TimeLimitSec)
-    return get(model.inner.options, :MaxTime, 1000.0)
+    return get(model.inner.options, "MaxTime", 1000.0)
 end
 
 include(joinpath("moi", "util.jl"))