diff --git a/base/show.jl b/base/show.jl
index 217b22ab39ef85..e40b59c6af7640 100644
--- a/base/show.jl
+++ b/base/show.jl
@@ -3007,7 +3007,9 @@ function dump(io::IOContext, x::DataType, n::Int, indent)
         fieldtypes = datatype_fieldtypes(x)
         for idx in 1:length(fields)
             println(io)
-            print(io, indent, "  ", fields[idx])
+            print(io, indent, "  ")
+            isconst(x, idx) && print(io, "const ")
+            print(io, fields[idx])
             if isassigned(fieldtypes, idx)
                 print(io, "::")
                 print(tvar_io, fieldtypes[idx])
diff --git a/test/show.jl b/test/show.jl
index 064ae76b6fe1ff..7aa0d5adbb0c5f 100644
--- a/test/show.jl
+++ b/test/show.jl
@@ -1263,7 +1263,7 @@ let repr = sprint(dump, :(x = 1))
     @test repr == "Expr\n  head: Symbol =\n  args: Array{Any}((2,))\n    1: Symbol x\n    2: $Int 1\n"
 end
 let repr = sprint(dump, Pair{String,Int64})
-    @test repr == "Pair{String, Int64} <: Any\n  first::String\n  second::Int64\n"
+    @test repr == "Pair{String, Int64} <: Any\n  const first::String\n  const second::Int64\n"
 end
 let repr = sprint(dump, Tuple)
     @test repr == "Tuple <: Any\n"