diff --git a/envconf.go b/envconf.go
index 5465e9f..cc44d47 100644
--- a/envconf.go
+++ b/envconf.go
@@ -55,30 +55,36 @@ func NewConfig() *Config {
 				if len(splitted) > 1 {
 					for count, _ := range splitted {
 						if count < len(splitted)-3 {
-							left := strings.Join(splitted[:count], "_")
-							right := strings.Join(splitted[count:], "_")
+							left := strings.Trim(strings.Join(splitted[:count], "_"), "_")
+							right := strings.Trim(strings.Join(splitted[count:], "_"), "_")
 							if len(config.mapEnv[left]) == 0 {
 								config.mapEnv[left] = make(map[string]string)
 								config.mapMapEnv[left] = make(map[string]map[string]string)
 								config.mapMapMapEnv[left] = make(map[string]map[string]map[string]string)
 							}
-							config.mapEnv[left][right] = key
+							if left != "" && right != "" {
+								config.mapEnv[left][right] = key
+							}
 
 							middle := splitted[count]
-							right = strings.Join(splitted[count+1:], "_")
+							right = strings.Trim(strings.Join(splitted[count+1:], "_"), "_")
 							if len(config.mapMapEnv[left][middle]) == 0 {
 								config.mapMapEnv[left][middle] = make(map[string]string)
 								config.mapMapMapEnv[left][middle] = make(map[string]map[string]string)
 							}
-							config.mapMapEnv[left][middle][right] = key
+							if left != "" && middle != "" && right != "" {
+								config.mapMapEnv[left][middle][right] = key
+							}
 
 							lmiddle := splitted[count]
 							rmiddle := splitted[count+1]
-							right = strings.Join(splitted[count+2:], "_")
+							right = strings.Trim(strings.Join(splitted[count+2:], "_"), "_")
 							if len(config.mapMapEnv[left][lmiddle][rmiddle]) == 0 {
 								config.mapMapMapEnv[left][lmiddle][rmiddle] = make(map[string]string)
 							}
-							config.mapMapMapEnv[left][lmiddle][rmiddle][right] = key
+							if left != "" && lmiddle != "" && rmiddle != "" && right != "" {
+								config.mapMapMapEnv[left][lmiddle][rmiddle][right] = key
+							}
 						}
 					}
 				}