diff --git a/lua/neotest-golang/lib/find.lua b/lua/neotest-golang/lib/find.lua
index bd2339cd..5b310902 100644
--- a/lua/neotest-golang/lib/find.lua
+++ b/lua/neotest-golang/lib/find.lua
@@ -6,6 +6,8 @@ local logger = require("neotest-golang.logging")
 
 local M = {}
 
+M.os_path_sep = package.config:sub(1, 1) -- "/" on Unix, "\" on Windows
+
 --- Find a file upwards in the directory tree and return its path, if found.
 --- @param filename string
 --- @param start_path string
@@ -19,7 +21,7 @@ function M.file_upwards(filename, start_path)
   while start_dir ~= home_dir do
     logger.debug("Searching for " .. filename .. " in " .. start_dir)
 
-    local try_path = start_dir .. "/" .. filename
+    local try_path = start_dir .. M.os_path_sep .. filename
     if vim.fn.filereadable(try_path) == 1 then
       logger.debug("Found " .. filename .. " at " .. try_path)
       return try_path
diff --git a/lua/neotest-golang/process.lua b/lua/neotest-golang/process.lua
index 964c4a4e..07464676 100644
--- a/lua/neotest-golang/process.lua
+++ b/lua/neotest-golang/process.lua
@@ -216,7 +216,7 @@ function M.decorate_with_go_package_and_test_name(
     local folderpath = vim.fn.fnamemodify(test_data.neotest_data.path, ":h")
     local tweaked_pos_id = pos_id:gsub(" ", "_")
     tweaked_pos_id = tweaked_pos_id:gsub('"', "")
-    tweaked_pos_id = tweaked_pos_id:gsub("::", "/")
+    tweaked_pos_id = tweaked_pos_id:gsub("::", lib.find.os_path_sep)
 
     for _, golistline in ipairs(golist_output) do
       if folderpath == golistline.Dir then
@@ -224,7 +224,9 @@ function M.decorate_with_go_package_and_test_name(
           if gotestline.Action == "run" and gotestline.Test ~= nil then
             if gotestline.Package == golistline.ImportPath then
               local pattern = lib.convert.to_lua_pattern(folderpath)
-                .. "/(.-)/"
+                .. lib.find.os_path_sep
+                .. "(.-)"
+                .. lib.find.os_path_sep
                 .. lib.convert.to_lua_pattern(gotestline.Test)
                 .. "$"
               match = tweaked_pos_id:find(pattern, 1, false)
diff --git a/lua/neotest-golang/runspec/namespace.lua b/lua/neotest-golang/runspec/namespace.lua
index 3e3efe68..80b9c521 100644
--- a/lua/neotest-golang/runspec/namespace.lua
+++ b/lua/neotest-golang/runspec/namespace.lua
@@ -9,7 +9,8 @@ local M = {}
 --- @return neotest.RunSpec | neotest.RunSpec[] | nil
 function M.build(pos)
   --- @type string
-  local test_folder_absolute_path = string.match(pos.path, "(.+)/")
+  local test_folder_absolute_path =
+    string.match(pos.path, "(.+)" .. lib.find.os_path_sep)
   local golist_data = lib.cmd.golist_data(test_folder_absolute_path)
 
   --- @type string