diff --git a/engine/aliases.go b/engine/aliases.go
index 419a70970..eda219baa 100644
--- a/engine/aliases.go
+++ b/engine/aliases.go
@@ -245,8 +245,9 @@ func (am *AliasHandler) RemoveReverseAlias(attr AttrReverseAlias, reply *string)
 	defer am.mu.Unlock()
 	rKey := utils.REVERSE_ALIASES_PREFIX + attr.Alias + attr.Target + attr.Context
 	if x, err := cache2go.Get(rKey); err == nil {
-		existingKeys := x.(map[string]struct{})
-		for key := range existingKeys {
+		existingKeys := x.(map[interface{}]struct{})
+		for iKey := range existingKeys {
+			key := iKey.(string)
 			// get destination id
 			elems := strings.Split(key, utils.CONCATENATED_KEY_SEP)
 			if len(elems) > 0 {
@@ -281,9 +282,9 @@ func (am *AliasHandler) GetReverseAlias(attr AttrReverseAlias, result *map[strin
 	aliases := make(map[string][]*Alias)
 	rKey := utils.REVERSE_ALIASES_PREFIX + attr.Alias + attr.Target + attr.Context
 	if x, err := cache2go.Get(rKey); err == nil {
-		existingKeys := x.(map[string]struct{})
-		for key := range existingKeys {
-
+		existingKeys := x.(map[interface{}]struct{})
+		for iKey := range existingKeys {
+			key := iKey.(string)
 			// get destination id
 			elems := strings.Split(key, utils.CONCATENATED_KEY_SEP)
 			var destID string