diff --git a/index.js b/index.js
index ec328bd..411a483 100644
--- a/index.js
+++ b/index.js
@@ -137,7 +137,7 @@ module.exports = {
         'radix': 'warn',
         'require-await': 'error',
         'vars-on-top': 'off', // todo: maybe warn later
-        'wrap-iife': 'error',
+        'wrap-iife': ['error', 'inside'],
         'yoda': 'error',
 
         // Strict Mode (https://eslint.org/docs/rules/#strict-mode)
diff --git a/test/not-ok.js b/test/not-ok.js
index 7cacc90..8321e37 100644
--- a/test/not-ok.js
+++ b/test/not-ok.js
@@ -20,6 +20,10 @@ function A() {
 
 new A();
 
+(function f() {
+    return 1;
+}());
+
 // use this function to mark a variable as used
 function useIt(...vals) {
     return vals;
diff --git a/test/ok.js b/test/ok.js
index c0ddc24..776b4e1 100644
--- a/test/ok.js
+++ b/test/ok.js
@@ -17,6 +17,10 @@ function A() {
 
 useIt(new A());
 
+(function f() {
+    return 1;
+})();
+
 // use this function to mark a variable as used
 function useIt(...vals) {
     return vals;
diff --git a/test/test.js b/test/test.js
index 702b4b0..fc49963 100644
--- a/test/test.js
+++ b/test/test.js
@@ -29,4 +29,5 @@ assert.deepStrictEqual(errors, [
     'quote-props',
     'quotes',
     'strict',
+    'wrap-iife'
 ]);