diff --git a/post-processor/vagrant/post-processor.go b/post-processor/vagrant/post-processor.go
index 004365d27..ea2144263 100644
--- a/post-processor/vagrant/post-processor.go
+++ b/post-processor/vagrant/post-processor.go
@@ -56,44 +56,27 @@ type Config struct {
 }
 
 type PostProcessor struct {
-	configs map[string]*Config
+	config Config
 }
 
 func (p *PostProcessor) ConfigSpec() hcldec.ObjectSpec {
-	panic("not implemented yet")
-	// return p.config.FlatMapstructure().HCL2Spec()
+	return p.config.FlatMapstructure().HCL2Spec()
 }
 
 func (p *PostProcessor) Configure(raws ...interface{}) error {
-	p.configs = make(map[string]*Config)
-	p.configs[""] = new(Config)
-	if err := p.configureSingle(p.configs[""], raws...); err != nil {
+	if err := p.configureSingle(&p.config, raws...); err != nil {
 		return err
 	}
-
-	// Go over any of the provider-specific overrides and load those up.
-	for name, override := range p.configs[""].Override {
-		subRaws := make([]interface{}, len(raws)+1)
-		copy(subRaws, raws)
-		subRaws[len(raws)] = override
-
-		config := new(Config)
-		p.configs[name] = config
-		if err := p.configureSingle(config, subRaws...); err != nil {
-			return fmt.Errorf("Error configuring %s: %s", name, err)
-		}
-	}
-
 	return nil
 }
 
 func (p *PostProcessor) PostProcessProvider(name string, provider Provider, ui packer.Ui, artifact packer.Artifact) (packer.Artifact, bool, error) {
-	config := p.configs[""]
-	if specificConfig, ok := p.configs[name]; ok {
-		config = specificConfig
+	config, err := p.specificConfig(name)
+	if err != nil {
+		return nil, false, err
 	}
 
-	err := CreateDummyBox(ui, config.CompressionLevel)
+	err = CreateDummyBox(ui, config.CompressionLevel)
 	if err != nil {
 		return nil, false, err
 	}
@@ -246,6 +229,17 @@ func (p *PostProcessor) configureSingle(c *Config, raws ...interface{}) error {
 	return nil
 }
 
+func (p *PostProcessor) specificConfig(name string) (Config, error) {
+	config := p.config
+	if _, ok := config.Override[name]; ok {
+		if err := mapstructure.Decode(config.Override[name], &config); err != nil {
+			err = fmt.Errorf("Error overriding config for %s: %s", name, err)
+			return config, err
+		}
+	}
+	return config, nil
+}
+
 func providerForName(name string) Provider {
 	switch name {
 	case "aws":
diff --git a/post-processor/vagrant/post-processor_test.go b/post-processor/vagrant/post-processor_test.go
index fccf4cf24..8d414bab2 100644
--- a/post-processor/vagrant/post-processor_test.go
+++ b/post-processor/vagrant/post-processor_test.go
@@ -46,7 +46,7 @@ func TestPostProcessorPrepare_compressionLevel(t *testing.T) {
 		t.Fatalf("err: %s", err)
 	}
 
-	config := p.configs[""]
+	config := p.config
 	if config.CompressionLevel != flate.DefaultCompression {
 		t.Fatalf("bad: %#v", config.CompressionLevel)
 	}
@@ -58,7 +58,7 @@ func TestPostProcessorPrepare_compressionLevel(t *testing.T) {
 		t.Fatalf("err: %s", err)
 	}
 
-	config = p.configs[""]
+	config = p.config
 	if config.CompressionLevel != 7 {
 		t.Fatalf("bad: %#v", config.CompressionLevel)
 	}
@@ -83,43 +83,48 @@ func TestPostProcessorPrepare_outputPath(t *testing.T) {
 	}
 }
 
-func TestPostProcessorPrepare_subConfigs(t *testing.T) {
+func TestSpecificConfig(t *testing.T) {
 	var p PostProcessor
 
-	f, err := ioutil.TempFile("", "packer")
-	if err != nil {
-		t.Fatalf("err: %s", err)
-	}
-	defer os.Remove(f.Name())
-
 	// Default
 	c := testConfig()
-	c["compression_level"] = 42
-	c["vagrantfile_template"] = f.Name()
+	c["compression_level"] = 1
+	c["output"] = "folder"
 	c["override"] = map[string]interface{}{
 		"aws": map[string]interface{}{
 			"compression_level": 7,
 		},
 	}
-	err = p.Configure(c)
+	if err := p.Configure(c); err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	// overrides config
+	config, err := p.specificConfig("aws")
 	if err != nil {
 		t.Fatalf("err: %s", err)
 	}
 
-	if p.configs[""].CompressionLevel != 42 {
-		t.Fatalf("bad: %#v", p.configs[""].CompressionLevel)
+	if config.CompressionLevel != 7 {
+		t.Fatalf("bad: %#v", config.CompressionLevel)
 	}
 
-	if p.configs[""].VagrantfileTemplate != f.Name() {
-		t.Fatalf("bad: %#v", p.configs[""].VagrantfileTemplate)
+	if config.OutputPath != "folder" {
+		t.Fatalf("bad: %#v", config.OutputPath)
 	}
 
-	if p.configs["aws"].CompressionLevel != 7 {
-		t.Fatalf("bad: %#v", p.configs["aws"].CompressionLevel)
+	// does NOT overrides config
+	config, err = p.specificConfig("virtualbox")
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if config.CompressionLevel != 1 {
+		t.Fatalf("bad: %#v", config.CompressionLevel)
 	}
 
-	if p.configs["aws"].VagrantfileTemplate != f.Name() {
-		t.Fatalf("bad: %#v", p.configs["aws"].VagrantfileTemplate)
+	if config.OutputPath != "folder" {
+		t.Fatalf("bad: %#v", config.OutputPath)
 	}
 }