diff --git a/homeassistant/components/rainbird/__init__.py b/homeassistant/components/rainbird/__init__.py
index 9cda4ec550f..14a81f2c665 100644
--- a/homeassistant/components/rainbird/__init__.py
+++ b/homeassistant/components/rainbird/__init__.py
@@ -37,7 +37,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     )
     await coordinator.async_config_entry_first_refresh()
 
-    hass.data[DOMAIN][entry.entry_id] = coordinator
+    hass.data.setdefault(DOMAIN, {})[entry.entry_id] = coordinator
 
     await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)