diff --git a/packer/build.go b/packer/build.go
index 7a1723da4..d2502625a 100644
--- a/packer/build.go
+++ b/packer/build.go
@@ -91,4 +91,5 @@ func (b *coreBuild) Run(ui Ui) Artifact {
 
 // Cancels the build if it is running.
 func (b *coreBuild) Cancel() {
+	b.builder.Cancel()
 }
diff --git a/packer/build_test.go b/packer/build_test.go
index aed5b8ecb..a8870a59a 100644
--- a/packer/build_test.go
+++ b/packer/build_test.go
@@ -92,3 +92,15 @@ func TestBuild_RunBeforePrepare(t *testing.T) {
 
 	testBuild().Run(testUi())
 }
+
+func TestBuild_Cancel(t *testing.T) {
+	assert := asserts.NewTestingAsserts(t, true)
+
+	build := testBuild()
+	build.Cancel()
+
+	coreB := build.(*coreBuild)
+
+	builder := coreB.builder.(*TestBuilder)
+	assert.True(builder.cancelCalled, "cancel should be called")
+}