diff --git a/base/interactiveutil.jl b/base/interactiveutil.jl
index 68fceb78b513d..3db65c1f32892 100644
--- a/base/interactiveutil.jl
+++ b/base/interactiveutil.jl
@@ -667,7 +667,7 @@ Print information about exported global variables in a module, optionally restri
 
 The memory consumption estimate is an approximate lower bound on the size of the internal structure of the object.
 """
-function whos(io::IO=STDOUT, m::Module=current_module(), pattern::Regex=r"^(?!.*(Base|Main|Core)).*$")
+function whos(io::IO=STDOUT, m::Module=current_module(), pattern::Regex=r"")
     maxline = displaysize(io)[2]
     line = zeros(UInt8, maxline)
     head = PipeBuffer(maxline + 1)
@@ -677,17 +677,20 @@ function whos(io::IO=STDOUT, m::Module=current_module(), pattern::Regex=r"^(?!.*
             value = getfield(m, v)
             @printf head "%30s " s
             try
-                bytes = summarysize(value)
-                if bytes < 10_000
-                    @printf(head, "%6d bytes  ", bytes)
+                if s ∈ ("Base", "Main", "Core")
+                    print(head, "              ")
                 else
-                    @printf(head, "%6d KB     ", bytes ÷ (1024))
+                    bytes = summarysize(value)
+                    if bytes < 10_000
+                        @printf(head, "%6d bytes  ", bytes)
+                    else
+                        @printf(head, "%6d KB     ", bytes ÷ (1024))
+                    end
                 end
                 print(head, summary(value))
             catch e
                 print(head, "#=ERROR: unable to show value=#")
             end
-
             newline = search(head, UInt8('\n')) - 1
             if newline < 0
                 newline = nb_available(head)