diff --git a/viper.go b/viper.go
index c45abc8..e658a8e 100644
--- a/viper.go
+++ b/viper.go
@@ -262,6 +262,14 @@ func IsSet(key string) bool {
 	return t != nil
 }
 
+// Have viper check ENV variables for all
+// keys set in config, default & flags
+func AutomaticEnv() {
+	for _, x := range AllKeys() {
+		BindEnv(x)
+	}
+}
+
 // Aliases provide another accessor for the same key.
 // This enables one to change a name without breaking the application
 func RegisterAlias(alias string, key string) {
diff --git a/viper_test.go b/viper_test.go
index fba5a18..9818138 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -135,9 +135,15 @@ func TestEnv(t *testing.T) {
 
 	os.Setenv("ID", "13")
 	os.Setenv("FOOD", "apple")
+	os.Setenv("NAME", "crunk")
 
 	assert.Equal(t, "13", Get("id"))
 	assert.Equal(t, "apple", Get("f"))
+	assert.Equal(t, "Cake", Get("name"))
+
+	AutomaticEnv()
+
+	assert.Equal(t, "crunk", Get("name"))
 }
 
 func TestAllKeys(t *testing.T) {