diff --git a/README.md b/README.md
index a06bedb..9f236b2 100644
--- a/README.md
+++ b/README.md
@@ -212,6 +212,7 @@
  * GetStringMapString(key string) : map[string]string
  * GetStringSlice(key string) : []string
  * GetTime(key string) : time.Time
+ * GetDuration(key string) : time.Duration
  * IsSet(key string) : bool
 
 One important thing to recognize is that each Get function will return
diff --git a/viper.go b/viper.go
index dda7091..e808887 100644
--- a/viper.go
+++ b/viper.go
@@ -267,6 +267,8 @@
 		return cast.ToFloat64(val)
 	case time.Time:
 		return cast.ToTime(val)
+	case time.Duration:
+		return cast.ToDuration(val)
 	case []string:
 		return val
 	}
@@ -298,6 +300,11 @@
 	return cast.ToTime(v.Get(key))
 }
 
+func GetDuration(key string) time.Duration { return v.GetDuration(key) }
+func (v *viper) GetDuration(key string) time.Duration {
+	return cast.ToDuration(v.Get(key))
+}
+
 func GetStringSlice(key string) []string { return v.GetStringSlice(key) }
 func (v *viper) GetStringSlice(key string) []string {
 	return cast.ToStringSlice(v.Get(key))