diff --git a/src/ProtoStruct.jl b/src/ProtoStruct.jl
index 0dc16b5..34c959a 100644
--- a/src/ProtoStruct.jl
+++ b/src/ProtoStruct.jl
@@ -161,7 +161,7 @@ macro proto(expr)
                 end
 
                 function Base.show(io::IO, o::$name)
-                    vals = join([x[] isa String ? "\"$(x[])\"" : x[] for x in getfield(o, :properties)], ", ")
+                    vals = join([x isa Base.RefValue ? (x[] isa String ? "\"$(x[])\"" : x[]) : x for x in getfield(o, :properties)], ", ")
                     params = typeof(o).parameters[1:end-$N_any_params-1]
                     if isempty(params)
                         print(io, string($name), "($vals)")
diff --git a/test/test_ProtoStruct.jl b/test/test_ProtoStruct.jl
index a532a6d..f1e7a2e 100644
--- a/test/test_ProtoStruct.jl
+++ b/test/test_ProtoStruct.jl
@@ -153,6 +153,7 @@ end
         const B = :no
         const C::T = 3
         D
+        const E::Vector{Int} = Int[]
     end
 
     @testset "const fields" begin
@@ -160,6 +161,7 @@ end
         @test cf.A == 1
         @test cf.B == :no
         @test cf.C == 3
+        @test_nowarn show(devnull, cf)
         cf.A = 5
         @test_throws ErrorException cf.B = :yes
         @test_throws ErrorException cf.C = 5