diff --git a/utils/delta.go b/utils/delta.go
index fd384dd3..39570552 100644
--- a/utils/delta.go
+++ b/utils/delta.go
@@ -3,27 +3,27 @@ package utils
 func Delta(a []string, b []string) ([]string, []string, []string) {
 	maintained := make([]string, 0)
 	dismissed := make([]string, 0)
-	hash := make(map[string]bool)
+	hash := make(map[string]int)
 
 	for _, item := range a {
-		hash[item] = true
+		hash[item] = 1
 	}
 
 	for _, item := range b {
-		if hash[item] {
+		if hash[item] > 0 {
 			maintained = append(maintained, item)
-			delete(hash, item)
+			hash[item] = 2
 		} else {
 			dismissed = append(dismissed, item)
 		}
 	}
 
-	introduced := make([]string, len(hash))
+	introduced := make([]string, 0)
 
-	i := 0
-	for k := range hash {
-		introduced[i] = k
-		i++
+	for k, v := range hash {
+		if v == 1 {
+			introduced = append(introduced, k)
+		}
 	}
 
 	return introduced, maintained, dismissed