diff --git a/buildinfo.txt b/buildinfo.txt
index 0d4c9e9..aee5c5f 100644
--- a/buildinfo.txt
+++ b/buildinfo.txt
@@ -21,6 +21,7 @@ copy and rename new files (must be done manually as far as I can see)
 - Add version info to NEWS
 - Enable unicode in lualibs-unicode (until we remove the dependency ...)
 - Disable outer return statements in lualibs-util-jsn and lualibs-util-zip
+- In `lualibs-dir.lua`, replace all `mkdir(pth)` with `mkdir(pth .. '/')`.
 
 
 ## Step 4
diff --git a/lualibs-dir.lua b/lualibs-dir.lua
index 3164068..0ffe3f3 100644
--- a/lualibs-dir.lua
+++ b/lualibs-dir.lua
@@ -473,7 +473,7 @@ if onwindows then
                 pth = pth .. "/" .. s
             end
             if make_indeed and not isdir(pth) then
-                mkdir(pth)
+                mkdir(pth .. '/')
             end
         end
         return pth, (isdir(pth) == true)
@@ -525,7 +525,7 @@ else
                     pth = pth .. "/" .. s
                 end
                 if make_indeed and not first and not isdir(pth) then
-                    mkdir(pth)
+                    mkdir(pth .. '/')
                 end
             end
         else
@@ -533,7 +533,7 @@ else
             for s in gmatch(str,"[^/]+") do
                 pth = pth .. "/" .. s
                 if make_indeed and not isdir(pth) then
-                    mkdir(pth)
+                    mkdir(pth .. '/')
                 end
             end
         end