diff --git a/types/ember/ember-tests.ts b/types/ember/ember-tests.ts
index f2d8805864..3964d68a86 100644
--- a/types/ember/ember-tests.ts
+++ b/types/ember/ember-tests.ts
@@ -182,7 +182,27 @@ const mix2 = Ember.Mixin.create({
     bar: 2,
 });
 
-const component1 = Ember.Component.extend(mix1, mix2, {
+const mix3 = Ember.Mixin.create({
+    foo: 3,
+});
+
+const mix4 = Ember.Mixin.create({
+    bar: 4,
+});
+
+const mix5 = Ember.Mixin.create({
+    foo: 5,
+});
+
+const mix6 = Ember.Mixin.create({
+    bar: 6,
+});
+
+const mix7 = Ember.Mixin.create({
+    foo: 7,
+});
+
+const component1 = Ember.Component.extend(mix1, mix2, mix3, mix4, mix5, mix6, mix7, {
     lyft: Ember.inject.service(),
     cars: Ember.computed.readOnly('lyft.cars'),
 });
diff --git a/types/ember/index.d.ts b/types/ember/index.d.ts
index c69832e367..60b2f28f70 100644
--- a/types/ember/index.d.ts
+++ b/types/ember/index.d.ts
@@ -913,6 +913,11 @@ declare namespace Ember {
         static extend<T>(args?: CoreObjectArguments): T;
         static extend<T>(mixin1: Mixin, args?: CoreObjectArguments): T;
         static extend<T>(mixin1: Mixin, mixin2: Mixin, args?: CoreObjectArguments): T;
+        static extend<T>(mixin1: Mixin, mixin2: Mixin, mixin3: Mixin, args?: CoreObjectArguments): T;
+        static extend<T>(mixin1: Mixin, mixin2: Mixin, mixin3: Mixin, mixin4: Mixin, args?: CoreObjectArguments): T;
+        static extend<T>(mixin1: Mixin, mixin2: Mixin, mixin3: Mixin, mixin4: Mixin, mixin5: Mixin, args?: CoreObjectArguments): T;
+        static extend<T>(mixin1: Mixin, mixin2: Mixin, mixin3: Mixin, mixin4: Mixin, mixin5: Mixin, mixin6: Mixin, args?: CoreObjectArguments): T;
+        static extend<T>(mixin1: Mixin, mixin2: Mixin, mixin3: Mixin, mixin4: Mixin, mixin5: Mixin, mixin6: Mixin, mixin7: Mixin, args?: CoreObjectArguments): T;
 
         /**
         Creates a new subclass.