diff --git a/modules/nixos/homeassistant/services/esphome/cyd-base-ui.yaml b/modules/nixos/homeassistant/services/esphome/cyd-base-ui.yaml
index 04f7ed0..64b56fb 100644
--- a/modules/nixos/homeassistant/services/esphome/cyd-base-ui.yaml
+++ b/modules/nixos/homeassistant/services/esphome/cyd-base-ui.yaml
@@ -8,6 +8,9 @@ lvgl:
     - my_display
   touchscreens:
     - touchscreen_id: ts_touch
+  # Use a 1/10th frame buffer (~15KB) instead of the default full frame (~150KB).
+  # Required on CYDs without PSRAM. The display is rendered in horizontal strips.
+  buffer_size: 10%
 
   style_definitions:
     - id: style_tile