diff --git a/builtin/providers/heroku/resource_heroku_addon.go b/builtin/providers/heroku/resource_heroku_addon.go
index b53709007..96f4fa1bd 100644
--- a/builtin/providers/heroku/resource_heroku_addon.go
+++ b/builtin/providers/heroku/resource_heroku_addon.go
@@ -114,12 +114,7 @@ func resourceHerokuAddonRead(d *schema.ResourceData, meta interface{}) error {
 	d.Set("name", addon.Name)
 	d.Set("plan", plan)
 	d.Set("provider_id", addon.ProviderID)
-
-	configVarsMap := make(map[string]interface{})
-	for i := range addon.ConfigVars {
-		configVarsMap[addon.ConfigVars[i]] = addon.ConfigVars[i]
-	}
-	d.Set("config_vars", []interface{}{configVarsMap})
+	d.Set("config_vars", []interface{}{addon.ConfigVars})
 
 	return nil
 }