diff --git a/index.js b/index.js
index 1cef23c..ad7ec38 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,5 @@
 let path = require('path')
 let extend = require('util')._extend
-let cwd = process.cwd()
 let BASE_ERROR = 'Circular dependency detected:\r\n'
 
 class CircularDependencyPlugin {
@@ -8,18 +7,20 @@ class CircularDependencyPlugin {
     this.options = extend({
       exclude: new RegExp('$^'),
       failOnError: false,
-      onDetected: false
+      onDetected: false,
+      cwd: process.cwd()
     }, options)
   }
 
   apply(compiler) {
     let plugin = this
+    let cwd = this.options.cwd
 
     compiler.plugin('compilation', (compilation) => {
       compilation.plugin('optimize-modules', (modules) => {
         for (let module of modules) {
           if (module.resource === undefined) { continue }
-          let maybeCyclicalPathsList = isCyclic(module, module, {})
+          let maybeCyclicalPathsList = this.isCyclic(module, module, {})
           if (maybeCyclicalPathsList) {
             // allow consumers to override all behavior with onDetected
             if (plugin.options.onDetected) {
@@ -52,43 +53,45 @@ class CircularDependencyPlugin {
       })
     })
   }
-}
 
-function isCyclic(initialModule, currentModule, seenModules) {
-  // Add the current module to the seen modules cache
-  seenModules[currentModule.debugId] = true
+  isCyclic(initialModule, currentModule, seenModules) {
+    let cwd = this.options.cwd
 
-  // If the modules aren't associated to resources
-  // it's not possible to display how they are cyclical
-  if (!currentModule.resource || !initialModule.resource) {
-    return false
-  }
+    // Add the current module to the seen modules cache
+    seenModules[currentModule.debugId] = true
 
-  // Iterate over the current modules dependencies
-  for (let dependency of currentModule.dependencies) {
-    let depModule = dependency.module
-    if (!depModule) { continue }
+    // If the modules aren't associated to resources
+    // it's not possible to display how they are cyclical
+    if (!currentModule.resource || !initialModule.resource) {
+      return false
+    }
+
+    // Iterate over the current modules dependencies
+    for (let dependency of currentModule.dependencies) {
+      let depModule = dependency.module
+      if (!depModule) { continue }
 
-    if (depModule.debugId in seenModules) {
-      if (depModule.debugId === initialModule.debugId) {
-        // Initial module has a circular dependency
-        return [
-          path.relative(cwd, currentModule.resource),
-          path.relative(cwd, depModule.resource)
-        ]
+      if (depModule.debugId in seenModules) {
+        if (depModule.debugId === initialModule.debugId) {
+          // Initial module has a circular dependency
+          return [
+            path.relative(cwd, currentModule.resource),
+            path.relative(cwd, depModule.resource)
+          ]
+        }
+        // Found a cycle, but not for this module
+        continue
       }
-      // Found a cycle, but not for this module
-      continue
-    }
 
-    let maybeCyclicalPathsList = isCyclic(initialModule, depModule, seenModules)
-    if (maybeCyclicalPathsList) {
-      maybeCyclicalPathsList.unshift(path.relative(cwd, currentModule.resource))
-      return maybeCyclicalPathsList
+      let maybeCyclicalPathsList = this.isCyclic(initialModule, depModule, seenModules)
+      if (maybeCyclicalPathsList) {
+        maybeCyclicalPathsList.unshift(path.relative(cwd, currentModule.resource))
+        return maybeCyclicalPathsList
+      }
     }
-  }
 
-  return false
+    return false
+  }
 }
 
 module.exports = CircularDependencyPlugin
diff --git a/package-lock.json b/package-lock.json
index eb56232..3b1fcfc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,8 +1,7 @@
 {
   "name": "circular-dependency-plugin",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "lockfileVersion": 1,
-  "requires": true,
   "dependencies": {
     "acorn": {
       "version": "5.1.1",
diff --git a/package.json b/package.json
index 275593d..714e34c 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "webpack": "^3.5.5"
   },
   "description": "Detect modules with circular dependencies when bundling with webpack.",
-  "version": "4.2.0",
+  "version": "4.3.0",
   "engines": {
     "node": ">=6.0.0"
   },