diff --git a/test/repl.jl b/test/repl.jl
index 6b7f2a8a67..a37d0bbe06 100644
--- a/test/repl.jl
+++ b/test/repl.jl
@@ -737,7 +737,7 @@ end
     tmp_55850 = mktempdir()
     tmp_sym_link = joinpath(tmp_55850, "sym")
     symlink(tmp_55850, tmp_sym_link; dir_target=true)
-    withenv("JULIA_DEPOT_PATH" => join(tmp_sym_link, iswindows ? ";" : ":"), "JULIA_LOAD_PATH" => nothing) do
+    withenv("JULIA_DEPOT_PATH" => join(tmp_sym_link, Sys.iswindows ? ";" : ":"), "JULIA_LOAD_PATH" => nothing) do
         prompt = readchomp(`$(Base.julia_cmd()[1]) --project=$(dirname(@__DIR__)) --startup-file=no -e "using Pkg, REPL; Pkg.activate(io=devnull); REPLExt = Base.get_extension(Pkg, :REPLExt); print(REPLExt.promptf())"`)
         @test prompt == "(@v$(VERSION.major).$(VERSION.minor)) pkg> "
     end