diff --git a/frigate/config/camera/onvif.py b/frigate/config/camera/onvif.py
index d4955799b..fd35fa537 100644
--- a/frigate/config/camera/onvif.py
+++ b/frigate/config/camera/onvif.py
@@ -72,7 +72,7 @@ class PtzAutotrackConfig(FrigateBaseModel):
 
 
 class OnvifConfig(FrigateBaseModel):
-    host: str = Field(default="", title="Onvif Host")
+    host: EnvString = Field(default="", title="Onvif Host")
     port: int = Field(default=8000, title="Onvif Port")
     user: Optional[EnvString] = Field(default=None, title="Onvif Username")
     password: Optional[EnvString] = Field(default=None, title="Onvif Password")
diff --git a/frigate/config/mqtt.py b/frigate/config/mqtt.py
index a760d0a1f..3e2f99294 100644
--- a/frigate/config/mqtt.py
+++ b/frigate/config/mqtt.py
@@ -13,7 +13,7 @@ __all__ = ["MqttConfig"]
 
 class MqttConfig(FrigateBaseModel):
     enabled: bool = Field(default=True, title="Enable MQTT Communication.")
-    host: str = Field(default="", title="MQTT Host")
+    host: EnvString = Field(default="", title="MQTT Host")
     port: int = Field(default=1883, title="MQTT Port")
     topic_prefix: str = Field(default="frigate", title="MQTT Topic Prefix")
     client_id: str = Field(default="frigate", title="MQTT Client ID")