diff --git a/debian/package.go b/debian/package.go
index 0b61889f..c892846d 100644
--- a/debian/package.go
+++ b/debian/package.go
@@ -114,7 +114,7 @@ func NewPackageFromControlFile(input Stanza) *Package {
 
 // Key returns unique key identifying package
 func (p *Package) Key() []byte {
-	return []byte("P" + p.Name + " " + p.Version + " " + p.Architecture)
+	return []byte("P" + p.Architecture + " " + p.Name + " " + p.Version)
 }
 
 // Encode does msgpack encoding of Package
diff --git a/debian/package_test.go b/debian/package_test.go
index 9d4dc113..7600ea98 100644
--- a/debian/package_test.go
+++ b/debian/package_test.go
@@ -82,7 +82,7 @@ func (s *PackageSuite) TestWithProvides(c *C) {
 func (s *PackageSuite) TestKey(c *C) {
 	p := NewPackageFromControlFile(s.stanza)
 
-	c.Check(p.Key(), DeepEquals, []byte("Palien-arena-common 7.40-2 i386"))
+	c.Check(p.Key(), DeepEquals, []byte("Pi386 alien-arena-common 7.40-2"))
 }
 
 func (s *PackageSuite) TestEncodeDecode(c *C) {