diff --git a/lib/autoInject.js b/lib/autoInject.js
index 03f534eee..8d0033336 100644
--- a/lib/autoInject.js
+++ b/lib/autoInject.js
@@ -2,8 +2,8 @@ import auto from './auto';
 import wrapAsync from './internal/wrapAsync';
 import { isAsync } from './internal/wrapAsync';
 
-var FN_ARGS = /^(?:async\s+)?(?:function)?\s*[^(]*\(\s*([^)]+)\s*\)(?:\s*{)/m;
-var ARROW_FN_ARGS = /^(?:async\s+)?(?:function\s+)?\(?\s*([^)^=]+)\s*\)?(?:\s*=>)/m;
+var FN_ARGS = /^(?:async\s+)?(?:function)?\s*\w*\s*\(\s*([^)]+)\s*\)(?:\s*{)/;
+var ARROW_FN_ARGS = /^(?:async\s+)?\(?\s*([^)=]+)\s*\)?(?:\s*=>)/;
 var FN_ARG_SPLIT = /,/;
 var FN_ARG = /(=.+)?(\s*)$/;
 var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
diff --git a/test/autoInject.js b/test/autoInject.js
index 224783f29..3088faa60 100644
--- a/test/autoInject.js
+++ b/test/autoInject.js
@@ -148,4 +148,80 @@ describe('autoInject', () => {
             done();
         }, 25);
     });
+
+    it('should work with complicated functions', done => {
+        async.autoInject({
+            one: (cb) => cb(null, 1),
+            two: (cb) => cb(null, 2),
+            three: (cb) => cb(null, 3),
+            result: (one, two, three, cb) => {
+                if (!one || !two || !three) {
+                    return cb('fail')
+                }
+                function add (a, b, c) {
+                    return  a + b + c
+                }
+                add(one, two, three)
+                cb(null, 1 + 2 + 3)
+            }
+        }, (err, results) => {
+            expect(results).to.eql({ one: 1, two: 2, three: 3, result: 6 })
+            done()
+        })
+    })
+
+    it('should work with functions with args on multiple lines', done => {
+        async.autoInject({
+            one: (cb) => cb(null, 1),
+            two: (cb) => cb(null, 2),
+            three: (cb) => cb(null, 3),
+            result: function (
+                one,
+                two,
+                three,
+                cb
+            ) {
+                cb(null, 1 + 2 + 3)
+            }
+        }, (err, results) => {
+            expect(results).to.eql({ one: 1, two: 2, three: 3, result: 6 })
+            done()
+        })
+    })
+
+    it('should work with methods with args on multiple lines', done => {
+        async.autoInject({
+            one: (cb) => cb(null, 1),
+            two: (cb) => cb(null, 2),
+            three: (cb) => cb(null, 3),
+            result (
+                one,
+                two,
+                three,
+                cb
+            ) {
+                cb(null, 1 + 2 + 3)
+            }
+        }, (err, results) => {
+            expect(results).to.eql({ one: 1, two: 2, three: 3, result: 6 })
+            done()
+        })
+    })
+
+    it('should work with arrow functions with args on multiple lines', done => {
+        async.autoInject({
+            one: (cb) => cb(null, 1),
+            two: (cb) => cb(null, 2),
+            three: (cb) => cb(null, 3),
+            result: (
+                one,
+                two,
+                three,
+                cb
+            ) => cb(null, 1 + 2 + 3)
+        }, (err, results) => {
+            expect(results).to.eql({ one: 1, two: 2, three: 3, result: 6 })
+            done()
+        })
+    })
 });