diff --git a/pkg/package/package.go b/pkg/package/package.go
index 856e50e3..1137f14e 100644
--- a/pkg/package/package.go
+++ b/pkg/package/package.go
@@ -40,7 +40,7 @@ type Package interface {
 
 	GetRequires() []*DefaultPackage
 	GetConflicts() []*DefaultPackage
-	Expand([]Package) ([]Package, error)
+	Expand(*[]Package) ([]Package, error)
 	SetCategory(string)
 
 	GetName() string
@@ -220,10 +220,10 @@ func (p *DefaultPackage) Clone() Package {
 	return new
 }
 
-func (p *DefaultPackage) Expand(world []Package) ([]Package, error) {
+func (p *DefaultPackage) Expand(world *[]Package) ([]Package, error) {
 
 	var versionsInWorld []Package
-	for _, w := range world {
+	for _, w := range *world {
 		if w.GetName() != p.GetName() {
 			continue
 		}
diff --git a/pkg/package/package_test.go b/pkg/package/package_test.go
index 251d3230..7a1c0d84 100644
--- a/pkg/package/package_test.go
+++ b/pkg/package/package_test.go
@@ -29,7 +29,7 @@ var _ = Describe("Package", func() {
 		a11 := NewPackage("A", "1.1", []*DefaultPackage{}, []*DefaultPackage{})
 		a01 := NewPackage("A", "0.1", []*DefaultPackage{}, []*DefaultPackage{})
 		It("Expands correctly", func() {
-			lst, err := a.Expand([]Package{a1, a11, a01})
+			lst, err := a.Expand(&[]Package{a1, a11, a01})
 			Expect(err).ToNot(HaveOccurred())
 			Expect(lst).To(ContainElement(a11))
 			Expect(lst).To(ContainElement(a1))