diff --git a/src/constructors.js b/src/constructors.js
index c6ca352..ccc9a59 100644
--- a/src/constructors.js
+++ b/src/constructors.js
@@ -10,7 +10,8 @@ function getArrayFromArrayLikeObject (args) {
 }
 
 var isMethod = R.curry(function (object, propName) {
-  return !Object.getOwnPropertyDescriptor(object, propName).get && typeof object[ propName ] === 'function'
+  return !Object.getOwnPropertyDescriptor(object, propName).get &&
+    typeof object[ propName ] === 'function' && !(propName === 'constructor')
 })
 
 var applyToEachFunctionKeyInObject = function (appliedFunction, object) {
@@ -63,6 +64,8 @@ module.exports = function getStubOrSpyConstructor (getConstructorProperties) {
       return instance
     }
 
+    StubOrSpyConstructor.prototype = constructorProps.SourceConstructor.prototype
+
     function configureMethods (methods) {
       methodParams = methods
       return this
diff --git a/test/index.spec.js b/test/index.spec.js
index a1f241c..cfb12df 100644
--- a/test/index.spec.js
+++ b/test/index.spec.js
@@ -128,6 +128,11 @@ describe('getSpyConstructor', function () {
     expect(spiedObject.proto2()).to.equal('p2')
   })
 
+  it('should create instances of the original constructor', function () {
+    var spiedObject = new SpyConstructor()
+    expect(spiedObject).to.be.an.instanceof(TestConstructor)
+  })
+
   it('should put spies on all methods', function () {
     var spiedObject = new SpyConstructor()
 
@@ -193,6 +198,11 @@ describe('getSpy- and getStubConstructor', function () {
         NewConstructor = testData.getConstructor(TestConstructor)
       })
 
+      it('should create instances of itself', function () {
+        var instance = new NewConstructor()
+        expect(instance).to.be.an.instanceof(NewConstructor)
+      })
+
       describe('afterCreation', function () {
         it('should allow for manual post-processing before an instance is created', function () {
           NewConstructor.afterCreation(function (instance) {