diff --git a/src/pkgfiles.jl b/src/pkgfiles.jl
index 4854066..fa91be1 100644
--- a/src/pkgfiles.jl
+++ b/src/pkgfiles.jl
@@ -10,13 +10,13 @@ Note that `basedir` may be subsequently updated by Pkg operations such as `add`
 mutable struct PkgFiles
     id::PkgId
     basedir::String
-    files::Vector{Any}
+    files::Vector{String}
 end
 
-PkgFiles(id::PkgId, path::AbstractString) = PkgFiles(id, path, Any[])
+PkgFiles(id::PkgId, path::AbstractString) = PkgFiles(id, path, String[])
 PkgFiles(id::PkgId, ::Nothing) = PkgFiles(id, "")
 PkgFiles(id::PkgId) = PkgFiles(id, normpath(basepath(id)))
-PkgFiles(id::PkgId, files::Vector{Any}) =
+PkgFiles(id::PkgId, files::AbstractVector) =
     PkgFiles(id, normpath(basepath(id)), files)
 
 # Abstraction interface
diff --git a/test/runtests.jl b/test/runtests.jl
index c448802..40655e0 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -72,7 +72,7 @@ isdefined(Main, :Revise) ? Main.Revise.includet("script.jl") : include("script.j
     info = CodeTracking.PkgFiles(Base.PkgId(CodeTracking), nothing)
     @test isempty(CodeTracking.basedir(info))
 
-    info = CodeTracking.PkgFiles(Base.PkgId(CodeTracking), [])
+    info = CodeTracking.PkgFiles(Base.PkgId(CodeTracking), String[])
     @test length(CodeTracking.srcfiles(info)) == 0
 
     info = CodeTracking.PkgFiles(Base.PkgId(CodeTracking))
@@ -87,7 +87,7 @@ isdefined(Main, :Revise) ? Main.Revise.includet("script.jl") : include("script.j
     ioctx = IOContext(io, :compact=>true)
     show(ioctx, info)
     str = read(io, String)
-    @test match(r"PkgFiles\(CodeTracking, .*CodeTracking(\.jl)?, Any\[\]\)", str) !== nothing
+    @test match(r"PkgFiles\(CodeTracking, .*CodeTracking(\.jl)?, String\[\]\)", str) !== nothing
 
     @test pkgfiles("ColorTypes") === nothing
     @test_throws ErrorException pkgfiles("NotAPkg")