diff --git a/st2actions/st2actions/config.py b/st2actions/st2actions/config.py
index 7a98134278..504c7e5eb3 100644
--- a/st2actions/st2actions/config.py
+++ b/st2actions/st2actions/config.py
@@ -28,13 +28,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(CONF)
     CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2actions/st2actions/notifier/config.py b/st2actions/st2actions/notifier/config.py
index b18bb0417f..474d5447e5 100644
--- a/st2actions/st2actions/notifier/config.py
+++ b/st2actions/st2actions/notifier/config.py
@@ -21,17 +21,13 @@
 from st2common.constants.system import VERSION_STRING
 from st2common.constants.system import DEFAULT_CONFIG_FILE_PATH
 
-CONF = cfg.CONF
-
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2actions/st2actions/scheduler/config.py b/st2actions/st2actions/scheduler/config.py
index 422e52997b..614702f3f6 100644
--- a/st2actions/st2actions/scheduler/config.py
+++ b/st2actions/st2actions/scheduler/config.py
@@ -27,13 +27,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=sys_constants.VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2actions/st2actions/workflows/config.py b/st2actions/st2actions/workflows/config.py
index 6983a074b0..4e54aef02c 100644
--- a/st2actions/st2actions/workflows/config.py
+++ b/st2actions/st2actions/workflows/config.py
@@ -23,13 +23,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=sys_constants.VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2api/st2api/config.py b/st2api/st2api/config.py
index 6d5fe36b8a..e73c5c3936 100644
--- a/st2api/st2api/config.py
+++ b/st2api/st2api/config.py
@@ -32,13 +32,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2auth/st2auth/config.py b/st2auth/st2auth/config.py
index 1a346c8464..061075db7b 100644
--- a/st2auth/st2auth/config.py
+++ b/st2auth/st2auth/config.py
@@ -28,13 +28,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = st2cfg.St2EnvironmentConfigurationSource()
+    st2cfg.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2common/st2common/config.py b/st2common/st2common/config.py
index e3a802a15b..15a4d5b32a 100644
--- a/st2common/st2common/config.py
+++ b/st2common/st2common/config.py
@@ -908,13 +908,16 @@ def get_name(group_name, option_name):
         return "ST2_{}__{}".format(group_name.upper(), option_name.upper())
 
 
-def parse_args(args=None, ignore_errors=False):
+def use_st2_env_vars(conf: cfg.ConfigOpts) -> None:
     # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = St2EnvironmentConfigurationSource()
+    conf._env_driver = St2EnvironmentConfigurationSource()
+
+
+def parse_args(args=None, ignore_errors=False):
+    use_st2_env_vars(cfg.CONF)
     register_opts(ignore_errors=ignore_errors)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
diff --git a/st2reactor/st2reactor/cmd/trigger_re_fire.py b/st2reactor/st2reactor/cmd/trigger_re_fire.py
index acee891da6..d278aab835 100644
--- a/st2reactor/st2reactor/cmd/trigger_re_fire.py
+++ b/st2reactor/st2reactor/cmd/trigger_re_fire.py
@@ -48,8 +48,7 @@ def _parse_config():
     CONF.register_cli_opts(cli_opts)
     st2cfg.register_opts(ignore_errors=False)
 
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    CONF._env_driver = st2cfg.St2EnvironmentConfigurationSource()
+    st2cfg.use_st2_env_vars(CONF)
     CONF(args=sys.argv[1:])
 
 
diff --git a/st2reactor/st2reactor/garbage_collector/config.py b/st2reactor/st2reactor/garbage_collector/config.py
index febce172d7..66bf88bb5c 100644
--- a/st2reactor/st2reactor/garbage_collector/config.py
+++ b/st2reactor/st2reactor/garbage_collector/config.py
@@ -27,13 +27,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2reactor/st2reactor/rules/config.py b/st2reactor/st2reactor/rules/config.py
index 98895fb7cd..d05ce44d1e 100644
--- a/st2reactor/st2reactor/rules/config.py
+++ b/st2reactor/st2reactor/rules/config.py
@@ -25,13 +25,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2reactor/st2reactor/sensor/config.py b/st2reactor/st2reactor/sensor/config.py
index 653d30a276..f54a602167 100644
--- a/st2reactor/st2reactor/sensor/config.py
+++ b/st2reactor/st2reactor/sensor/config.py
@@ -26,13 +26,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = st2cfg.St2EnvironmentConfigurationSource()
+    st2cfg.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2reactor/st2reactor/timer/config.py b/st2reactor/st2reactor/timer/config.py
index 9561de75e7..02c868cb8c 100644
--- a/st2reactor/st2reactor/timer/config.py
+++ b/st2reactor/st2reactor/timer/config.py
@@ -25,13 +25,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2stream/st2stream/config.py b/st2stream/st2stream/config.py
index cbc83c055e..e820c249df 100644
--- a/st2stream/st2stream/config.py
+++ b/st2stream/st2stream/config.py
@@ -32,13 +32,11 @@
 
 
 def parse_args(args=None):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     cfg.CONF(
         args=args,
         version=VERSION_STRING,
         default_config_files=[DEFAULT_CONFIG_FILE_PATH],
-        use_env=True,  # Make our env var support explicit (default is True)
     )
 
 
diff --git a/st2tests/st2tests/config.py b/st2tests/st2tests/config.py
index 575d6addd4..95bf49314f 100644
--- a/st2tests/st2tests/config.py
+++ b/st2tests/st2tests/config.py
@@ -39,11 +39,10 @@ def reset():
 
 
 def parse_args(args=None, coordinator_noop=True):
-    # Override oslo_config's 'OS_' env var prefix with 'ST2_'.
-    cfg.CONF._env_driver = common_config.St2EnvironmentConfigurationSource()
+    common_config.use_st2_env_vars(cfg.CONF)
     _setup_config_opts(coordinator_noop=coordinator_noop)
 
-    kwargs = {"use_env": True}
+    kwargs = {}
     if USE_DEFAULT_CONFIG_FILES:
         kwargs["default_config_files"] = [DEFAULT_CONFIG_FILE_PATH]