diff --git a/src/config/project/prefs/index.js b/src/config/project/prefs/index.js
index 3c5dfa9..c4bab52 100644
--- a/src/config/project/prefs/index.js
+++ b/src/config/project/prefs/index.js
@@ -7,11 +7,17 @@ let { parse } = require('./dotenv')
 let { homedir } = require('os')
 
 module.exports = function getPrefs ({ scope, inventory, errors, _testing }) {
-  /* istanbul ignore next */
   let cwd = scope === 'global'
-    ? _testing ? join(inventory._project.cwd, homedir()) : homedir()
+    ? homedir()
     : inventory._project.cwd
 
+  /* istanbul ignore next */
+  if (_testing && scope === 'global') {
+    let _homedir = homedir()
+    if (process.platform === 'win32') _homedir = _homedir.replace(/^[A-Z]:\\/, '')
+    cwd = join(inventory._project.cwd, _homedir)
+  }
+
   let envFilepath = join(cwd, '.env')
   let hasEnvFile = scope === 'local' && existsSync(envFilepath)
   let prefs = read({ type: 'preferences', cwd, errors })
diff --git a/test/integration/preferences-test.js b/test/integration/preferences-test.js
index 9ae61b3..626bd7a 100644
--- a/test/integration/preferences-test.js
+++ b/test/integration/preferences-test.js
@@ -1,14 +1,17 @@
 let { join } = require('path')
-let { homedir } = require('os')
 let test = require('tape')
-let sut = join(process.cwd(), 'src', 'index')
-let inv = require(sut)
 let mockTmp = require('mock-tmp')
+let cwd = process.cwd()
+let testLibPath = join(cwd, 'test', 'lib')
+let { getHomedir } = require(testLibPath)
+let sut = join(cwd, 'src', 'index')
+let inv = require(sut)
 
-let mock = join(process.cwd(), 'test', 'mock')
+let _homedir = getHomedir()
+let mock = join(cwd, 'test', 'mock')
 let arc = '@app\nappname\n@events\nan-event' // Not using @http so we can skip ASAP filesystem checks
 let reset = () => mockTmp.reset()
-let _testing = true, cwd
+let _testing = true
 
 /**
  * Duplicates some unit tests as part of the larger whole integration test
@@ -56,8 +59,8 @@ testing
   env_var_1 foo
   env_var_2 bar
 `
-  let path = join(homedir(), '.prefs.arc')
-  cwd = mockTmp({
+  let path = join(_homedir, '.prefs.arc')
+  let cwd = mockTmp({
     'app.arc': arc,
     [path]: prefsText
   })
@@ -198,8 +201,8 @@ staging
       production: null,
     }
   }
-  let path = join(homedir(), '.prefs.arc')
-  cwd = mockTmp({
+  let path = join(_homedir, '.prefs.arc')
+  let cwd = mockTmp({
     'app.arc': arc,
     [path]: globalPrefsText,
     'preferences.arc': localPrefsText
@@ -239,7 +242,7 @@ test('Preferences validation errors', async t => {
 @env
 foo
 `
-  cwd = mockTmp({
+  let cwd = mockTmp({
     'app.arc': arc,
     'prefs.arc': prefs,
   })
diff --git a/test/lib/index.js b/test/lib/index.js
index 82e2ab2..620e3c5 100644
--- a/test/lib/index.js
+++ b/test/lib/index.js
@@ -1,5 +1,12 @@
+let { homedir } = require('os')
 let { is } = require('../../src/lib')
 
+function getHomedir () {
+  let _homedir = homedir()
+  if (process.platform === 'win32') _homedir = _homedir.replace(/^[A-Z]:\\/, '')
+  return _homedir
+}
+
 function setterPluginSetup (setter, fns) {
   let methods = is.array(fns) ? fns : [ fns ]
   methods = methods.map(m => {
@@ -11,5 +18,6 @@ function setterPluginSetup (setter, fns) {
 }
 
 module.exports = {
-  setterPluginSetup
+  getHomedir,
+  setterPluginSetup,
 }
diff --git a/test/unit/src/config/project/index-test.js b/test/unit/src/config/project/index-test.js
index b37ad66..88629fa 100644
--- a/test/unit/src/config/project/index-test.js
+++ b/test/unit/src/config/project/index-test.js
@@ -1,8 +1,9 @@
 let { join } = require('path')
-let { homedir } = require('os')
 let test = require('tape')
 let mockTmp = require('mock-tmp')
 let cwd = process.cwd()
+let testLibPath = join(cwd, 'test', 'lib')
+let { getHomedir } = require(testLibPath)
 let inventoryDefaultsPath = join(process.cwd(), 'src', 'defaults')
 let inventoryDefaults = require(inventoryDefaultsPath)
 let defaultFunctionConfigPath = join(process.cwd(), 'src', 'defaults', 'function-config')
@@ -11,7 +12,9 @@ let sut = join(cwd, 'src', 'config', 'project')
 let getProjectConfig = require(sut)
 
 let localPrefsFile = 'prefs.arc'
-let globalPrefsFile = join(homedir(), 'prefs.arc')
+let _homedir = getHomedir()
+let globalPrefsFile = join(_homedir, 'prefs.arc')
+let _testing = true
 
 test('Set up env', t => {
   t.plan(1)
@@ -99,7 +102,7 @@ useAWS true`
     [globalPrefsFile]: globalPrefs
   })
   inventory = inventoryDefaults({ cwd })
-  proj = getProjectConfig({ arc, errors, inventory, _testing: true })
+  proj = getProjectConfig({ arc, errors, inventory, _testing })
   t.equal(errors.length, 0, 'Did not error')
   t.ok(proj.preferences, 'Populated preferences')
   t.equal(proj.preferences.env.testing.fiz, 'buz', 'Populated testing env')
@@ -117,7 +120,7 @@ useAWS true`
     [globalPrefsFile]: globalPrefs,
   })
   inventory = inventoryDefaults({ cwd })
-  proj = getProjectConfig({ arc, errors, inventory, _testing: true })
+  proj = getProjectConfig({ arc, errors, inventory, _testing })
   t.equal(errors.length, 0, 'Did not error')
   t.ok(proj.preferences, 'Populated preferences')
   t.equal(proj.preferences.env.testing.foo, 'bar', 'Populated testing env (preferred local to global prefs)')
diff --git a/test/unit/src/config/project/prefs/index-test.js b/test/unit/src/config/project/prefs/index-test.js
index 5fac341..6bba19a 100644
--- a/test/unit/src/config/project/prefs/index-test.js
+++ b/test/unit/src/config/project/prefs/index-test.js
@@ -1,14 +1,16 @@
 let { join } = require('path')
-let { homedir } = require('os')
 let test = require('tape')
 let mockTmp = require('mock-tmp')
 let cwd = process.cwd()
+let testLibPath = join(cwd, 'test', 'lib')
+let { getHomedir } = require(testLibPath)
 let inventoryDefaultsPath = join(cwd, 'src', 'defaults')
 let inventoryDefaults = require(inventoryDefaultsPath)
 let sut = join(cwd, 'src', 'config', 'project', 'prefs')
 let getPrefs = require(sut)
 
-let path = join(homedir(), '.prefs.arc')
+let _homedir = getHomedir()
+let path = join(_homedir, '.prefs.arc')
 let reset = () => mockTmp.restore()
 function clean (preferences) {
   // Delete the meta stuff so the actual preferences match during an equality check