diff --git a/envconf.go b/envconf.go
index 61ae76c..6a27336 100644
--- a/envconf.go
+++ b/envconf.go
@@ -21,9 +21,11 @@ type cEntry struct {
 }
 
 type Config struct {
-	parsed bool
-	env    map[string]cEntry
-	mapEnv map[string]map[string]string
+	parsed       bool
+	env          map[string]cEntry
+	mapEnv       map[string]map[string]string
+	mapMapEnv    map[string]map[string]map[string]string
+	mapMapMapEnv map[string]map[string]map[string]map[string]string
 }
 
 // NewConfig returns an envconf.Config that is used to read configuration from environment variables.
@@ -34,6 +36,8 @@ func NewConfig() *Config {
 	config.parsed = false
 	config.env = make(map[string]cEntry)
 	config.mapEnv = make(map[string]map[string]string)
+	config.mapMapEnv = make(map[string]map[string]map[string]string)
+	config.mapMapMapEnv = make(map[string]map[string]map[string]map[string]string)
 
 	for _, v := range os.Environ() {
 		splitted := strings.SplitN(v, "=", 2)
@@ -54,8 +58,28 @@ func NewConfig() *Config {
 						right := 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 count < len(splitted)-2 {
+							middle := splitted[count]
+							right = 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 count < len(splitted)-3 {
+							lmiddle := splitted[count]
+							rmiddle := splitted[count+1]
+							right = 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
+						}
 					}
 				}
 			}