diff --git a/testdata/arch/arch.tar.gz b/testdata/arch/arch.tar.gz
new file mode 100644
index 00000000..fb9ca46c
Binary files /dev/null and b/testdata/arch/arch.tar.gz differ
diff --git a/testdata/arch/arch2.tar.gz b/testdata/arch/arch2.tar.gz
new file mode 100644
index 00000000..f715bb8b
Binary files /dev/null and b/testdata/arch/arch2.tar.gz differ
diff --git a/testdata/arch/arch3.tar.gz b/testdata/arch/arch3.tar.gz
new file mode 100644
index 00000000..5570b144
Binary files /dev/null and b/testdata/arch/arch3.tar.gz differ
diff --git a/testdata/arch/blank.tar.gz b/testdata/arch/blank.tar.gz
new file mode 100644
index 00000000..231a8d13
Binary files /dev/null and b/testdata/arch/blank.tar.gz differ
diff --git a/worker.go b/worker.go
index a9c82762..ae00a167 100644
--- a/worker.go
+++ b/worker.go
@@ -510,6 +510,15 @@ func computeAncestryFeatures(ancestryLayers []database.LayerWithContent) ([]data
 		// all detectable features removed is to pass in the file status.
 		for vf, mapF := range currentFeatures {
 			features[vf] = mapF
+			/*
+				// FIXME: Arch Linux installed packages are a list of directories
+				if len(features[vf]) == 0 {
+					features[vf] = make(map[string]database.NamespacedFeature)
+				}
+				for k, f := range mapF {
+				    features[vf][k] = f
+				}
+			*/
 		}
 	}
 
diff --git a/worker_test.go b/worker_test.go
index 5f6e0ff4..b0e0bbeb 100644
--- a/worker_test.go
+++ b/worker_test.go
@@ -30,6 +30,7 @@ import (
 	"github.com/coreos/clair/pkg/strutil"
 
 	// Register the required detectors.
+	_ "github.com/coreos/clair/ext/featurefmt/alpm"
 	_ "github.com/coreos/clair/ext/featurefmt/dpkg"
 	_ "github.com/coreos/clair/ext/featurefmt/rpm"
 	_ "github.com/coreos/clair/ext/featurens/aptsources"
@@ -337,7 +338,7 @@ func TestProcessAncestryWithDistUpgrade(t *testing.T) {
 
 	nonUpgradedMap := map[database.Feature]struct{}{}
 	for _, f := range nonUpgradedFeatures {
-		f.VersionFormat = "dpkg"
+		f.VersionFormat = dpkg.ParserName
 		nonUpgradedMap[f] = struct{}{}
 	}
 
@@ -435,6 +436,36 @@ func TestProcessLayers(t *testing.T) {
 	}
 }
 
+func TestProcessArchLayers(t *testing.T) {
+	_, f, _, _ := runtime.Caller(0)
+	testDataPath := filepath.Join(filepath.Dir(f)) + "/testdata/arch/"
+
+	datastore := newMockDatastore()
+
+	// suppose there are multiple arch layers
+	layers := []LayerRequest{
+		{Hash: "blank", Path: testDataPath + "blank.tar.gz"},
+		{Hash: "arch", Path: testDataPath + "arch.tar.gz"},
+		{Hash: "arch2", Path: testDataPath + "arch2.tar.gz"},
+		{Hash: "arch3", Path: testDataPath + "arch3.tar.gz"},
+	}
+
+	Processors = database.Processors{
+		Detectors: []string{"os-release"},
+		Listers:   []string{"alpm"},
+	}
+
+	assert.Nil(t, ProcessAncestry(datastore, "Docker", "Mock", layers))
+	assert.Len(t, datastore.ancestry["Mock"].Features, 6)
+
+	// check the namespaces are correct
+	for _, f := range datastore.ancestry["Mock"].Features {
+		if !assert.NotEqual(t, database.Namespace{}, f.Namespace) {
+			assert.Fail(t, "Every feature should have a namespace attached")
+		}
+	}
+}
+
 // TestUpgradeClair checks if a clair is upgraded and certain ancestry's
 // features should not change. We assume that Clair should only upgrade
 func TestClairUpgrade(t *testing.T) {