diff --git a/nonebot/config.py b/nonebot/config.py
index af1aa8e4..c998fd7a 100644
--- a/nonebot/config.py
+++ b/nonebot/config.py
@@ -83,9 +83,8 @@ class CustomEnvSettings(EnvSettingsSource):
             d[field.alias] = env_val
 
         if env_file_vars:
-            for env_name, env_val in env_file_vars.items():
-                if (env_val is None or len(env_val) == 0) and env_name in env_vars:
-                    env_val = env_vars[env_name]
+            for env_name in env_file_vars.keys():
+                env_val = env_vars[env_name]
                 try:
                     if env_val:
                         env_val = settings.__config__.json_loads(env_val.strip())
diff --git a/tests/.env.test b/tests/.env.test
index 038f1ffd..ba30adf9 100644
--- a/tests/.env.test
+++ b/tests/.env.test
@@ -2,3 +2,4 @@ LOG_LEVEL=TRACE
 NICKNAME=["test"]
 SUPERUSERS=["test", "fake:faketest"]
 CONFIG_FROM_ENV=
+CONFIG_OVERRIDE=old
diff --git a/tests/test_init.py b/tests/test_init.py
index a62520d0..f137e9d7 100644
--- a/tests/test_init.py
+++ b/tests/test_init.py
@@ -3,6 +3,7 @@ import os
 import pytest
 
 os.environ["CONFIG_FROM_ENV"] = '{"test": "test"}'
+os.environ["CONFIG_OVERRIDE"] = "new"
 
 
 @pytest.mark.asyncio
@@ -25,6 +26,7 @@ async def test_init(nonebug_init):
 
     config = get_driver().config
     assert config.config_from_env == {"test": "test"}
+    assert config.config_override == "new"
     assert config.config_from_init == "init"
     assert config.common_config == "common"