diff --git a/provisioner/puppet-masterless/provisioner.go b/provisioner/puppet-masterless/provisioner.go
index 5a0288cba..682aa584e 100644
--- a/provisioner/puppet-masterless/provisioner.go
+++ b/provisioner/puppet-masterless/provisioner.go
@@ -122,6 +122,17 @@ func (p *Provisioner) Prepare(raws ...interface{}) error {
 		}
 	}
 
+	for i, path := range p.config.ModulePaths {
+		info, err := os.Stat(path)
+		if err != nil {
+			errs = packer.MultiErrorAppend(errs,
+				fmt.Errorf("module_path[%d] is invalid: %s", i, err))
+		} else if !info.IsDir() {
+			errs = packer.MultiErrorAppend(errs,
+				fmt.Errorf("module_path[%d] must point to a directory"))
+		}
+	}
+
 	if errs != nil && len(errs.Errors) > 0 {
 		return errs
 	}
diff --git a/provisioner/puppet-masterless/provisioner_test.go b/provisioner/puppet-masterless/provisioner_test.go
index e2e4b3c96..88dea6029 100644
--- a/provisioner/puppet-masterless/provisioner_test.go
+++ b/provisioner/puppet-masterless/provisioner_test.go
@@ -2,12 +2,19 @@ package puppetmasterless
 
 import (
 	"github.com/mitchellh/packer/packer"
+	"io/ioutil"
+	"os"
 	"testing"
 )
 
 func testConfig() map[string]interface{} {
+	tf, err := ioutil.TempFile("", "packer")
+	if err != nil {
+		panic(err)
+	}
+
 	return map[string]interface{}{
-	// "inline": []interface{}{"foo", "bar"},
+		"manifest_file": tf.Name(),
 	}
 }
 
@@ -18,3 +25,61 @@ func TestProvisioner_Impl(t *testing.T) {
 		t.Fatalf("must be a Provisioner")
 	}
 }
+
+func TestProvisionerPrepare_manifestFile(t *testing.T) {
+	config := testConfig()
+
+	delete(config, "manifest_file")
+	p := new(Provisioner)
+	err := p.Prepare(config)
+	if err == nil {
+		t.Fatal("should be an error")
+	}
+
+	// Test with a good one
+	tf, err := ioutil.TempFile("", "packer")
+	if err != nil {
+		t.Fatalf("error tempfile: %s", err)
+	}
+	defer os.Remove(tf.Name())
+
+	config["manifest_file"] = tf.Name()
+	p = new(Provisioner)
+	err = p.Prepare(config)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+}
+
+func TestProvisionerPrepare_modulePaths(t *testing.T) {
+	config := testConfig()
+
+	delete(config, "module_paths")
+	p := new(Provisioner)
+	err := p.Prepare(config)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	// Test with bad paths
+	config["module_paths"] = []string{"i-should-not-exist"}
+	p = new(Provisioner)
+	err = p.Prepare(config)
+	if err == nil {
+		t.Fatal("should be an error")
+	}
+
+	// Test with a good one
+	td, err := ioutil.TempDir("", "packer")
+	if err != nil {
+		t.Fatalf("error: %s", err)
+	}
+	defer os.RemoveAll(td)
+
+	config["module_paths"] = []string{td}
+	p = new(Provisioner)
+	err = p.Prepare(config)
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+}