diff --git a/pkg/constants/levels.go b/pkg/constants/levels.go
index c265131..a29a3c4 100644
--- a/pkg/constants/levels.go
+++ b/pkg/constants/levels.go
@@ -1,7 +1,7 @@
 package constants
 
 // StandardXPTable represents the standard skill XP curve
-var StandardXPTable = []uint64{
+var StandardXPTable = []int64{
 	0,
 	83,
 	174,
@@ -131,7 +131,7 @@ var StandardXPTable = []uint64{
 }
 
 // EliteXPTable represents the elite skill XP curve
-var EliteXPTable = []uint64{
+var EliteXPTable = []int64{
 	0,
 	830,
 	1861,
diff --git a/pkg/types/skills.go b/pkg/types/skills.go
index bc21351..d618bc0 100644
--- a/pkg/types/skills.go
+++ b/pkg/types/skills.go
@@ -42,18 +42,16 @@ const (
 )
 
 // GetVirtualLevel gets the virtual level for the given XP
-func (s Skill) GetVirtualLevel(XP uint64) uint32 {
+func (s Skill) GetVirtualLevel(XP int64) int {
 	table := constants.StandardXPTable
 
 	if s.IsEliteSkill() {
 		table = constants.EliteXPTable
 	}
 
-	i := sort.Search(len(table), func(i int) bool {
+	return sort.Search(len(table), func(i int) bool {
 		return table[i] > XP
 	})
-
-	return uint32(i)
 }
 
 // IsStandardSkill determines if the provided skill is a standard skill
diff --git a/pkg/types/skills_test.go b/pkg/types/skills_test.go
index 4ee6069..8390d6e 100644
--- a/pkg/types/skills_test.go
+++ b/pkg/types/skills_test.go
@@ -53,8 +53,8 @@ func TestGetVirtualLevel(t *testing.T) {
 	cases := []struct {
 		name     string
 		skill    types.Skill
-		XP       uint64
-		expected uint32
+		XP       int64
+		expected int
 	}{
 		{"standard skill 0 xp", types.Attack, 0, 1},
 		{"elite skill 0 xp", types.Invention, 0, 1},